Ultimate Sims 4 RPO Mod Guide (July 2025) All Modules

If you've been playing The Sims 4 and feeling like the relationship and pregnancy systems are too shallow, predictable, and lacking emotional depth, you're not alone. While the Lovestruck expansion added some improvements to romance mechanics, the base game still treats pregnancies as simple happy events, relationships as binary states, and family dynamics as one-dimensional experiences.

That's where the revolutionary Relationship & Pregnancy Overhaul (RPO) mod by Lumpinou comes in – transforming these core gameplay elements into richly complex, emotionally nuanced systems that mirror real-life experiences.

The RPO mod isn't just another gameplay tweak; it's a complete reimagining of how your Sims form relationships, navigate pregnancy, handle family conflicts, and experience the full spectrum of human emotions. With 19 interconnected modules (and more in development), this comprehensive collection adds layers of depth that make vanilla gameplay feel empty in comparison.

Whether you want realistic pregnancy preferences, complex custody arrangements, relationship breaks instead of instant breakups, or the drama of paternity tests and cheating scandals, RPO delivers an unprecedented level of realism and storytelling potential. For players who enjoy using relationship cheats or pregnancy cheats, RPO provides a more organic and immersive way to control these aspects of gameplay.

In this comprehensive guide, we'll explore every aspect of the RPO mod collection, from basic installation to advanced features, troubleshooting common issues, and maximizing your gameplay experience. By the time you finish reading, you'll have everything you need to transform your Sims 4 into a deeply engaging life simulation that actually reflects the beautiful complexity of human relationships.

What Is the Relationship & Pregnancy Overhaul (RPO) Mod?

The Relationship & Pregnancy Overhaul mod (previously known as "WooHoo Wellness") is a massive collection of 19+ interconnected modules created by modder Lumpinou. First released in 2020, the mod has evolved from a simple pregnancy enhancement into a comprehensive overhaul of The Sims 4's relationship, pregnancy, and family systems. Each module focuses on different aspects of gameplay, allowing players to pick and choose which features they want to implement.

The mod's modular design is one of its greatest strengths. Not comfortable with teen pregnancy mechanics? Simply don't install Module 5. Want the relationship drama without the medical aspects? Skip the WooHoo Transmissible Diseases module. This flexibility ensures that every player can customize their experience to match their comfort level and storytelling preferences.

As of July 2025, the RPO collection includes 19 active modules with several more in development, including romantic trust systems, post-pregnancy recovery, social judgment mechanics, and love languages. The mod is regularly updated to maintain compatibility with the latest game patches and continues to expand with new features based on community feedback.

Key Features That Transform Your Gameplay

Pregnancy & Family Preferences System

Unlike the base game where every Sim seems thrilled about pregnancy, Module 1 introduces a comprehensive preference system. Sims can want children desperately, be neutral, or actively not want children. These preferences affect their reactions to pregnancy news, creating genuine relationship tension when partners have conflicting desires. The system also includes preferences for siblings, grandchildren, baby names, and even the biological sex of future children.

Realistic Fertility & Protection Mechanics

Module 2 overhauls the pregnancy risk system with individual fertility levels, birth control options, sterilization surgeries, and protection agreements between partners. Sims are automatically assigned fertility statistics with a 5% chance of infertility, adding realistic challenges for couples trying to conceive. The module includes various birth control methods from pills to surgical options, each with their own effectiveness rates and gameplay implications.

WooHoo Transmissible Diseases (WTDs)

Module 3 adds a layer of consequence to casual WooHoo with various transmissible diseases. Sims can contract conditions ranging from temporary infections to permanent diseases, leading to awkward conversations, accusations of cheating, and relationship drama. The module includes both real and fictional disease names (player's choice) and realistic symptoms that affect gameplay.

Paternity Testing & Drama

Module 4 introduces the ability to discover biological parentage through paternity tests. The results take 24 Sim hours and can lead to various dramatic scenarios: lying about results, manipulating partners into marriage, rejecting offspring, or coming clean about affairs. This module creates compelling storylines around family secrets and relationship betrayals.

Teen Pregnancy Reactions

Module 5 adds realistic consequences for teen pregnancies, including panic reactions, parental responses (ranging from supportive to rejection), social judgment, and special moodlets reflecting the overwhelming responsibility. Teen parents may receive judgmental phone calls from NPCs and face unique challenges balancing school with impending parenthood.

Relationship Breaks & Separations

Module 6 revolutionizes breakups by introducing temporary separations. Instead of immediately ending relationships, couples can take breaks to evaluate their feelings, work through problems, or ultimately decide to reconcile or permanently separate. This adds realistic relationship progression that mirrors real-world dynamics.

Complex Jealousy & Cheating System

Module 7 expands jealousy mechanics with customizable settings at both global and individual levels. Cheating consequences vary based on severity – flirting, kissing, or WooHoo trigger different reactions and sentiments. Partners can confront cheaters, demand explanations, lie about the extent of their infidelity, forgive, or end relationships based on these interactions.

Artificial Insemination & Surrogacy

Module 8 provides alternative family-building options including artificial insemination and surrogacy arrangements. Same-sex couples and single Sims can pursue parenthood through these methods, creating complex family structures. The surrogacy system includes finding surrogate mothers, managing the pregnancy process, and navigating the emotional complexities of these arrangements.

Adoption System Overhaul

Module 9 completely reimagines adoption mechanics. Instead of simply calling and receiving a child, Sims must complete applications, meet agency criteria, and go through approval processes. The module also allows Sims to put children up for adoption through agencies or directly to friends/family, with options for amicable agreements or custody battles.

Custody & Child Support Systems

Module 10 introduces comprehensive custody arrangements for separated parents. Features include scheduled custody visits, child support payments, co-parenting negotiations, and various custody schedules (weekends, alternating weeks, etc.). Children automatically transfer between households according to custody agreements, though delays can occur based on game circumstances.

Pregnancy Termination Options

Module 11 provides sensitive handling of pregnancy termination with varied emotional responses based on pregnancy preferences. Partners can accompany Sims to appointments, and both experience complex emotions reflecting the difficulty of such decisions. This optional module treats the subject with appropriate gravity and emotional nuance.

Pregnancy Symptom Expansion

Module 12 adds realistic pregnancy symptoms including mood swings, cravings, back pain, and other physical discomforts. These symptoms create more engaging pregnancy gameplay beyond the simple moodlets of the base game, making each trimester feel distinct and challenging.

Additional Modules (13-19)

The collection continues with modules covering pregnancy reactions and acceptance, special pregnancy circumstances, romance and friendship enhancements, the Meet&Mingle dating app, Charm & Chemistry attraction system, expanded WooHoo options, and Adult Life features including WooHoo drive, styles, roles, and preferences.

Sims 4 RPO Mod - Complete Installation Guide

System Requirements

• The Sims 4 base game (latest patch recommended)
• Mods enabled in game settings
• Script mods enabled in game settings
• At least 500MB free space in Mods folder
• Compatible with PC/Mac (console versions do not support mods)
• A decent laptop for Sims 4 for optimal performance with heavy modding

Download Sources

All RPO modules are available for free on Lumpinou's Patreon page. While early access versions are available to patrons, all modules become publicly available within 3 weeks per EA's modding policy. Never download from unauthorized sources as these may contain malware or outdated files.

Step-by-Step Installation Process

1. Enable Mods in Game Settings
   • Launch The Sims 4
   • Go to Game Options > Other
   • Check "Enable Custom Content and Mods"
   • Check "Script Mods Allowed"
   • Apply changes and restart the game
2. Download the Mod Files
   • Visit Lumpinou's Patreon page
   • Navigate to the RPO collection posts
   • Download either the all-in-one package or individual modules
   • For new users, the all-in-one package is recommended
3. Extract and Install Files
   • Extract the downloaded ZIP files
   • Place all .package and .ts4script files directly in your Mods folder
   • Location: Documents\Electronic Arts\The Sims 4\Mods
   • Files can be in one subfolder deep, but no deeper
4. Critical Installation Notes
   • REMOVE all old RPO files before installing new versions
   • KEEP your settings file when updating from v2.9+
   • DELETE settings file if updating from v2.8 or earlier
   • Keep any M19 custom action files if you have them
5. Verify Installation
   • Launch the game
   • Check for the RPO pie menu when clicking on Sims
   • Access RPO settings through the computer or phone
   • Ensure no Last Exception errors appear

Load Order Considerations

Place RPO files directly in your Mods folder or one subfolder deep. The mod should load after any other relationship or pregnancy mods to ensure proper functionality. If using with other major mods, test different load orders to find the optimal configuration.

Essential Compatibility Information

Mods Requiring Special Configuration

Wicked Whims (WW)

• Disable WW's pregnancy system to avoid conflicts
• Turn off WW's fertility features
• RPO will handle all pregnancy-related mechanics
• WW's intimate animations remain fully compatible
• For a complete guide, see our Wicked Whims installation tutorial

MC Command Center (MCCC)

• Disable MC WooHoo module if using RPO's fertility system
• Keep MCCC's other modules active
• Both mods can coexist with proper settings

Slice of Life (SOL)

• Remove SOL's menstrual cycle component
• Other SOL features remain compatible
• Personality and emotion systems work well together

SimDa Dating App

• Incompatible with RPO's Meet&Mingle module
• Choose one dating app system
• Other features of both mods remain usable

Known Incompatibilities

• Pregnancy overhaul mods (choose RPO or alternatives)
• Other paternity/custody mods
• Mods altering the adoption system
• Custom relationship progression mods (case-by-case basis)

In-Depth Module Configuration

Global Settings Access

Access RPO settings through:

• Computer > MCCC/More Options > RPO Settings
• Phone > RPO Menu > Settings
• Sim click menu > RPO > Settings (if enabled)

Module 1: Pregnancy Preferences Configuration

• Set default preferences for townies
• Configure auto-preference assignment rules
• Adjust preference change triggers
• Customize reaction intensities

Module 2: Fertility Settings

• Global pregnancy risk percentage (0-100%)
• Individual fertility overrides
• Birth control effectiveness rates
• Surgery success rates and recovery times

Module 3: WTD Configuration

• Choose real or fictional disease names
• Set transmission probabilities
• Configure symptom severity
• Enable/disable specific diseases

Modules 4-10: Relationship Drama Settings

• Paternity test accuracy and timing
• Teen pregnancy reaction severity
• Separation duration options
• Jealousy triggers and thresholds
• Cheating consequence severity
• Custody visit schedules and reliability
• Child support payment amounts

Performance Optimization Settings

• Reduce autonomous checks for better performance
• Limit notification frequency
• Disable visual effects if experiencing lag
• Adjust retroactive relationship scanning

Comprehensive Gameplay Guide

Starting Your RPO Journey

Initial Setup for Existing Saves When first installing RPO in an existing save, the mod will retroactively scan relationships and assign preferences. This process may cause longer loading times initially but only happens once. For households with many relationships, expect a 1-3 minute delay on first load.

Setting Preferences for Your Sims

1. Click on your Sim and navigate to RPO > Family & Pregnancy
2. Set pregnancy desire preferences
3. Configure partner protection agreements
4. Establish fertility status if desired
5. Set baby name and gender preferences

Creating Compelling Storylines The RPO mod excels at creating emergent storytelling opportunities. Consider these narrative setups:

• Conflicting pregnancy desires in married couples
• Surprise pregnancies with protection failure
• Paternity mysteries and family secrets
• Teen pregnancy family dynamics
• Custody battles after messy divorces
• Surrogacy arrangements for diverse families

Managing Pregnancies

Early Pregnancy Discovery

• Pregnancy tests show accurate results
• Partners can "Ask if Pregnant" to prompt announcements
• Initial reactions vary based on preferences
• Morning sickness and symptoms begin immediately

Navigating Preference Conflicts When partners have different pregnancy desires:

• Expect relationship strain and negative moodlets
• Use "Discuss Pregnancy Feelings" interactions
• Work through conflicts or face relationship consequences
• Preferences may change over time with life events

Pregnancy Progression

• First trimester: Symptoms, announcements, initial reactions
• Second trimester: Possible preference acceptance, planning
• Third trimester: Preparation, nest building, final acceptance
• Each stage includes unique moodlets and interactions

Relationship Management

Preventing Infidelity

• Set individual jealousy levels for each Sim
• Establish relationship boundaries early
• Use protection agreements to build trust
• Monitor partner satisfaction and address issues

Handling Cheating Scandals When infidelity occurs:

1. Confrontation options based on evidence level
2. Cheater can confess, lie, or minimize
3. Victim chooses to forgive or separate
4. Long-term trust damage affects future interactions

Navigating Separations

• Initiate breaks instead of immediate breakups
• Use separation time for self-reflection
• Attempt reconciliation with new promises
• Move toward permanent separation if needed

Family Building Alternatives

Surrogacy Process

1. Find willing surrogate (friend or NPC)
2. Initiate surrogacy agreement
3. Manage surrogate's pregnancy
4. Prepare for baby's arrival
5. Navigate post-birth relationships

Adoption Journey

1. Apply through adoption agency
2. Meet eligibility requirements
3. Wait for approval process
4. Choose child when available
5. Complete adoption finalization

Artificial Insemination

1. Visit clinic or arrange donor
2. Undergo procedure (may require multiple attempts)
3. Manage pregnancy independently
4. Establish parental rights if needed

Complex Family Dynamics

Co-Parenting After Separation

• Establish custody schedules
• Manage child transfers between homes
• Handle child support payments
• Navigate new relationships with ex-partners

Blended Family Challenges

• Introduce new partners to children
• Manage step-family relationships
• Balance multiple custody arrangements
• Create new family traditions

Troubleshooting Common Issues

Installation Problems

"RPO Menu Not Appearing"

• Verify mods and script mods are enabled
• Check file placement (not too deep in folders)
• Remove old RPO versions completely
• Clear cache files and repair game

"Empty Text/Missing Strings"

• Old translation files present
• Incomplete file removal from previous versions
• Download fresh files and remove all old ones
• Check for conflicting translation mods

Gameplay Issues

"Pregnancy Test Not Working"

• Ensure Module 2 is properly installed
• Check if Sim has had recent WooHoo
• Verify no conflicting pregnancy mods
• Use debug menu to check pregnancy status

"Custody Visits Failing"

• Children may not transfer if Sims are busy
• Invite other parent to lot to trigger transfer
• Use "End Visit Early" or "Get Child Back" options
• Reload household if persistent issues

"Surrogates Can't Give Birth at Hospital"

• Known limitation to preserve surrogate system
• Use home birth option instead
• Hospital births may break surrogate assignments
• Complete surrogate process before hospital

Performance Optimization

"Lag After Installing RPO" For saves previously using v2.8:

1. Remove all RPO files
2. Load affected household for 1 minute
3. Save game without RPO
4. Reinstall latest RPO version
5. Load save with fresh installation

"Game Freezing During WooHoo"

• Update Wicked Whims to latest version
• Check for mod conflicts
• Disable WW pregnancy systems
• Clear WW cache files

"Long Loading Times"

• Normal for first load with retroactive scanning
• Reduce active modules if persistent
• Disable unused features in settings
• Consider fresh save for best performance

Error Resolution

"LastException Errors"

1. Note which interaction caused error
2. Check if all RPO modules are updated
3. Remove conflicting mods temporarily
4. Report persistent errors to Lumpinou

"Settings Not Saving"

• Don't delete settings file when updating
• Ensure file permissions allow writing
• Check for corrupted settings file
• Reset to defaults if necessary

Advanced Features & Hidden Mechanics

Debug Menu & Cheats

Accessing Debug Options

1. Enable debug in RPO settings (first option)
2. Access through Sim click menu > Actions > RPO Special Actions
3. Use "Sim Special Actions" for comprehensive attribute summary
4. Similar to using UI Cheats Extension, but specifically for RPO features

Useful Debug Commands

• Add/remove pregnancy preferences instantly
• Force pregnancy or terminate without gameplay
• Assign specific WTDs for testing
• Reset relationship statuses
• Clear pregnancy markers manually

Autonomous Behaviors

Upcoming Autonomy Module Future updates will include optional autonomous:

• Protection decision changes
• Relationship break initiations
• Adoption requests
• Affair confessions
• Divorce proceedings

Integration with Custom Content

Custom Preference Traits

• RPO integrates with modded attraction traits
• Compatible with custom gender/orientation mods
• Works with personality overhaul mods
• Enhances custom career pregnancy leaves

Visual Compatibility

• Custom pregnancy morphs supported
• Works with default replacement skins
• Compatible with custom pregnancy clothes
• Pregnancy walk style can be disabled

Maximizing Your RPO Experience

Recommended Module Combinations

For Realistic Family Play

• Modules 1, 2, 8, 9, 10, 12
• Focus on family planning and child-rearing
• Add custody complexity for divorced families
• Include adoption for diverse family structures

For Maximum Drama

• All modules except 11 (if uncomfortable)
• Enable all jealousy and cheating features
• Use strict preference settings
• Allow autonomous preference changes

For Casual Enhanced Gameplay

• Modules 1, 2, 6, 7, 15
• Basic pregnancy and relationship improvements
• Skip medical/disease aspects
• Focus on emotional depth

Storytelling Tips

Document Your Journey

• Screenshot key moments
• Write family histories
• Track preference changes
• Create multi-generational stories

Embrace Unexpected Outcomes

• Let preference conflicts drive narratives
• Don't force happy endings
• Allow relationships to naturally evolve
• Use setbacks for character development

Challenge Scenarios

1. Teen pregnancy in strict family
2. Conflicting pregnancy desires in newlyweds
3. Paternity mystery with multiple suspects
4. Custody battle with career complications
5. Surrogacy arrangement gone complicated

Community Integration

Sharing Your Stories

• Join Lumpinou's Discord for support
• Share experiences on Reddit (r/thesims)
• Create Let's Plays showcasing RPO features
• Submit feedback for future development

Getting Help

• Discord server for immediate support
• Patreon comments for bug reports
• Twitter for update notifications
• ModTheSims forum discussions

Future Development & Upcoming Features

Confirmed Upcoming Modules

Module 20: Extended Family DNA Testing

• Track relationships to great-great-grandparents
• Second cousins and complex family trees
• Retroactive family relationship detection
• Enhanced paternity testing options

Romantic Trust System

• New trust metric for each Sim
• Paranoid jealousy for low-trust Sims
• Easier relationships for high-trust Sims
• Trust-building and breaking mechanics

Post-Pregnancy Recovery

• Recovery period after birth/termination
• Physical and emotional healing process
• Partner support interactions
• Realistic postpartum experiences

Social Judgment System

• NPC reactions to player choices
• Reputation impacts from scandals
• Fame/wealth influence on judgment
• Community gossip mechanics

Love Languages Integration

• Five love languages for each Sim
• Relationship satisfaction based on languages
• Learning partner's love language
• Conflicts from mismatched languages

Community-Requested Features

Based on user feedback, potential future additions include:

• Miscarriage handling with emotional support
• Pregnancy complications and medical emergencies
• Step-family and in-law relationship dynamics
• Cultural/religious influences on relationships
• Polyamory and alternative relationship structures

Performance Optimization Guide

Initial Setup for Best Performance

1. Clean Installation
   • Remove all previous RPO versions
   • Clear cache files
   • Repair game through Origin/EA App
   • Install fresh RPO files
2. Settings Optimization
   • Disable unused modules
   • Reduce autonomous check frequency
   • Limit notification spam
   • Turn off retroactive scanning if not needed
3. Save Game Management
   • Use Save Cleaner tool regularly
   • Limit household relationship complexity
   • Manage town population
   • Clear unused pregnancy markers

Troubleshooting Performance Issues

High RAM Usage

• RPO is a complex mod requiring resources
• Close other applications while playing
• Increase virtual memory if needed
• Consider upgrading RAM for best experience

CPU Spikes

• Normal during initial relationship scanning
• Reduce autonomous behavior checks
• Limit active modules to essentials
• Update to latest RPO version

Graphics Lag

• Disable pregnancy walk style
• Reduce notification frequency
• Turn off visual effects in settings
• Check for conflicts with visual mods

Best Practices for Smooth Gameplay

1. Regular Maintenance
   • Update RPO with each game patch
   • Clean save files monthly
   • Remove unused modules
   • Check for mod conflicts regularly
2. Selective Feature Use
   • Start with core modules only
   • Add features gradually
   • Monitor performance impact
   • Disable problematic features
3. Save Game Hygiene
   • Regular saves before major events
   • Backup saves before updates
   • Clean household inventories
   • Manage relationship culling

Conclusion

The Relationship & Pregnancy Overhaul mod represents the pinnacle of Sims 4 modding, transforming shallow game mechanics into deeply engaging systems that reflect real-life complexity. With 19 modules and counting, RPO offers unprecedented customization and storytelling potential that makes vanilla gameplay feel hollow in comparison.

Whether you're seeking realistic family planning, dramatic relationship conflicts, or simply more emotional depth in your Sims' lives, RPO delivers a comprehensive overhaul that respects player choice while adding meaningful consequences to every decision. The mod's modular nature ensures that every player can craft their ideal experience, from wholesome family gameplay to scandal-filled soap operas.

As Lumpinou continues development with exciting features like romantic trust, love languages, and social judgment systems, the RPO collection will only grow more essential for players seeking authentic life simulation. The active community, regular updates, and responsive development make this mod a safe long-term investment in your Sims 4 experience.

Ready to transform your game? Download the RPO collection from Lumpinou's Patreon (free after early access period), follow our installation guide, and prepare for the most emotionally engaging Sims 4 experience available. Your Sims' relationships will never be the same – and that's exactly the point.

Frequently Asked Questions

Is RPO free to download?

Yes! All RPO modules are free on Lumpinou's Patreon. Early access versions are available to patrons for up to 3 weeks, then become publicly available per EA's modding policy.

Can I use RPO with Wicked Whims?

Yes, but you must disable WW's pregnancy and fertility systems. RPO handles all pregnancy mechanics while WW handles intimate animations.

Will RPO break my save game?

No, RPO is save-safe. However, always backup saves before adding major mods. Removing RPO may leave some hidden traits that won't affect gameplay.

How do I update RPO?

Remove ALL old files first, keep your settings file (if updating from v2.9+), then install new files. Never mix versions.

Why are custody visits not working perfectly?

The game's mechanics can delay transfers if Sims are busy. Use manual interventions like inviting parents or reloading to force transfers.

Can I use individual modules without the core?

No, Module 0 (Core Library) is required for all other modules to function. You can then add only the modules you want.

Does RPO work with the latest patch?

Lumpinou regularly updates RPO for compatibility. Check the Patreon page or Discord for patch status after game updates.

How do I report bugs or request features?

Join Lumpinou's Discord server, comment on Patreon posts, or use the official contact methods listed on the website.

Is RPO available for console?

No, The Sims 4 on PlayStation and Xbox doesn't support custom mods. RPO is PC/Mac only.

Can teens get pregnant with this mod?

Module 5 enables teen pregnancy with realistic consequences. This feature is optional and can be skipped if uncomfortable with the content.