Let’s be honest – even with the Lovestruck expansion’s improvements to romance and the turn-ons/turn-offs system, The Sims 4’s relationship and pregnancy mechanics still leave much to be desired. While Lovestruck added some depth with compatibility and attraction, pregnancies remain straightforward affairs, relationship conflicts lack real emotional weight, and family planning is essentially nonexistent.

But what if I told you there’s a mod that transforms these systems into something that actually resembles the beautiful complexity of real human experiences?

Enter the Sims 4 Relationship and Pregnancy Overhaul (RPO) mod by Lumpinou. This isn’t just another minor gameplay tweak – it’s a complete reinvention of how your Sims experience love, pregnancy, and family life. And trust me, once you try it, vanilla gameplay will feel emptier than a Sim’s friendship bar after three missed hangouts.

The family tree screenshot featured below is from MissLollypopSims’ Joy of Life Challenge. You can explore more of her engaging Sims 4 content on her YouTube channel.

What Exactly is the RPO Mod Collection?

The Relationship and Pregnancy Overhaul mod (previously known as “WooHoo Wellness”) is essentially a collection of 19 interconnected modules that work together to create remarkably realistic relationship and pregnancy experiences in The Sims 4. Each module focuses on different aspects, from fertility and protection to jealousy, custody arrangements, and even WooHoo transmissible diseases.

What makes this mod special is its modular nature – you can pick and choose which features you want in your game. Not comfortable with teen pregnancy or termination modules? Simply don’t install them. Want the full dramatic experience? Download the complete package for maximum realism.

The Evolution from WooHoo Wellness to RPO

When Lumpinou first released this mod, it was called “WooHoo Wellness,” but as it grew in scope and ambition, it evolved into the comprehensive RPO collection we have today. The mod is regularly updated with new features and fixes, showing the creator’s commitment to constantly improving the player experience.

As of May 2025, the collection includes 19 distinct modules with several more planned for future releases. That’s impressive dedication from a mod creator!

Core Modules: Transforming Relationships

Module 1: Pregnancy & Family Preferences

This is where it all begins. Unlike the base game where every Sim seems equally thrilled about pregnancy, this module introduces preference systems where your Sims can have distinct desires regarding children.

I recently had a Sim couple where one partner desperately wanted children while the other was firmly against the idea. This created genuine tension in their relationship that I had to navigate – something completely absent from vanilla gameplay. The preferences aren’t just for the couple either; existing children have opinions about siblings, and grandparents might pressure your Sims for grandchildren.

Module 2: Fertility and Protection

Gone are the days when “Try for Baby” automatically led to pregnancy. This module introduces individual fertility statistics, birth control options, and variable pregnancy risks that make family planning a genuine consideration rather than a guaranteed outcome.

About 5% of Sims are created with infertility, which can lead to heartbreaking but realistic storylines about couples struggling to conceive. You can purchase “WooHoo Protection” or hormonal birth control, which (just like in real life) can come with side effects like nausea and headaches.

I’ve found myself actually thinking about family planning in my gameplay now – weighing the pros and cons of different contraceptive methods and dealing with the occasional unplanned pregnancy when protection fails.

Module 3: WooHoo Transmissible Diseases

This module introduces consequences to romantic encounters that mirror real-world concerns. Sims can contract diseases through WooHoo, leading to uncomfortable conversations and medical treatments.

While potentially awkward, this module adds another layer of realism that encourages responsible behavior – or creates drama if your Sims are less careful. I’ve had Sims need to have difficult conversations with past partners, adding unexpected story complications that kept gameplay fresh.

Module 4: Paternity Testing

This module allows Sims to discover who fathered their child, with options to lie, tell the truth, manipulate others into marriage, or reject offspring. The process involves fathers using “Request Paternity Test” via RPO Special Actions, with results taking 24 Sim hours and appearing as notifications.

Module 5: Teen Pregnancy

If you’re creating more dramatic storylines, the teen pregnancy module adds realistic reactions including panic, parental responses (support or rejection), and social consequences. Teen parents receive special moodlets reflecting the overwhelming responsibility of parenthood, and may even receive phone notifications from NPCs expressing judgment.

I had a teen Sim whose strict parents were devastated by her pregnancy news – they ultimately supported her, but the family tension and the challenges of balancing school with impending parenthood created a genuinely compelling narrative.

Module 6: Temporary Separations

This module allows couples to take relationship breaks rather than immediately breaking up when problems arise. Sims can use this time to assess their relationship before deciding to reconcile or permanently separate. This adds a more realistic approach to relationship difficulties that mirrors real-world relationship challenges.

Module 7: Jealousy & Cheating

Let’s talk drama! In the base game, cheating is a simple binary – you either did it or didn’t, with predictable consequences. With the RPO mod, jealousy and cheating become multi-layered experiences with customizable settings.

Your Sims can:

• Blame or forgive their partners
• Lie about or confess to cheating
• React differently based on whether it was flirting, kissing, or WooHoo

I had a Sim who caught her partner flirting at a nightclub. Instead of immediately breaking up (the base game way), she confronted him, they had a heated argument, and ultimately decided to work through it – but trust was damaged and took time to rebuild. This kind of emotional nuance is what makes RPO feel so real.

Module 8: Artificial Insemination & Surrogacy

The RPO mod recognizes that there are many ways to build a family. This module introduces artificial insemination and surrogacy options, creating complex family structures that better represent real-world diversity. I helped my same-sex Sim couple navigate the surrogacy process, and the emotional journey from finding a surrogate to finally welcoming their baby felt incredibly meaningful.

Module 9: Adoption

Instead of simply ordering a baby through a phone call (seriously, base game?), prospective adoptive parents must:

• Fill out applications
• Meet criteria set by adoption agents
• Sometimes wait for approval

Meanwhile, Sims can put their children up for adoption (with agreement or disagreement from co-parents) and specify reasons such as financial struggles or family pressure. Additionally, adopted Sims can search for their biological parents later in life.

Module 10: Custody & Permanent Separstions

When relationships end in the vanilla game, ex-partners become little more than strangers who occasionally cross paths. With RPO, relationship endings – especially when children are involved – become complex situations requiring ongoing management.

The custody system lets you:

• Arrange amicable or contentious separations
• Set up visitation schedules
• Navigate the complicated emotions of divorce

I’ve found this particularly meaningful for storytelling. In one of my gameplay scenarios, a divorced couple maintained a civil relationship for their children’s sake, with the kids spending weekends with dad and weekdays with mom. These small details create immersive family dynamics that simply don’t exist in the base game.

Module 11: Termination of Pregnancy

This optional module allows Sims to terminate pregnancies and experience the complex emotions associated with such decisions. Reactions vary based on the pregnancy preferences established in Module 1, and partners can accompany Sims to pregnancy termination appointments. This adds a sensitive but realistic aspect to family planning decisions.

Module 12: Pregnancy Side Effects

Pregnancy in the base game is basically just a positive moodlet and a growing belly. RPO transforms this into a truly immersive experience with:

• Realistic pregnancy symptoms like mood swings, food cravings, and back pain
• Reactions based on whether the pregnancy was wanted
• The possibility of pregnancy complications

I won’t lie – experiencing a miscarriage with my Sim was genuinely emotional, especially when her partner comforted her through the grief. It’s these kinds of deeply human moments that make RPO so special.

Module 13: Miscarriage & Pregnancy Loss

This module introduces the possibility of miscarriages and ectopic pregnancies with customizable risk levels and various contributing factors. Lost pregnancies can optionally be added to the family tree and create an urn in the Sim’s inventory, allowing them to name and mourn unborn children. This adds a deeply emotional dimension to pregnancy experiences that reflects real-world challenges.

Module 14: Pregnancy Tweaks & Special Pregnancies

This module provides various settings and tweaks for pregnancy and family life, including options to disable pregnancy walkstyles or enable cryptic pregnancies where Sims may not know they’re pregnant until later stages. These customization options allow players to fine-tune their gameplay experience.

Module 15: Romances & Friendships

This module enhances dating life and friendships with special choices and quick controls for gender preferences and sexual orientation. It adds depth to non-familial relationships that complement the other relationship-focused modules.

Module 16: Meet&Mingle Dating App

The mod introduces an in-game dating app with customizable dating profiles, relationship goals, and various date types including blind dates. Players can set filters and preferences to find compatible matches for their Sims. This modernizes the dating experience in The Sims 4 to reflect contemporary dating culture.

Module 17: Charm & Chemistry (Attraction System)

This module adds an attraction system based on personality, life factors, and physical appearance, making romantic connections more nuanced and realistic. This creates more organic and believable relationship formation than the base game’s simplified attraction system.

Module 18: Expanded WooHoo

For those looking to spice things up, this module significantly expands WooHoo options, allowing Sims to WooHoo anywhere, on any object, and with multiple partners. It also introduces swinging and WooHoo parties as social events.

I threw a “WooHoo Party” in my game and was amazed at the complexity of social dynamics that emerged – jealousy from some partners, newfound connections between others, and a web of relationships that felt organic and unpredictable.

Module 19: Adult Life

This module adds WooHoo roles, drive, styles, and preferences to further enhance intimate relationship dynamics. These additions create more personalized and diverse romantic experiences for Sims.

Installation and Compatibility

Getting started with RPO is straightforward, but there are some important considerations:

1. Download from the source: The mod is available through Lumpinou’s Patreon page.
2. Mind your load order: Place RPO files directly in your Mods folder.
3. Check compatibility: Some modules may conflict with other relationship or pregnancy mods.

If you’re using Wicked Whims, you’ll want to disable its pregnancy and fertility systems to avoid conflicts. Similarly, Slice of Life users should remove its menstrual cycle component.

Troubleshooting Common Issues

RPO Interactions Not Appearing?

This typically happens due to improper installation or mod conflicts. Try:

• Ensuring all RPO files are placed directly in the Mods folder
• Enabling script mods in The Sims 4 settings
• Deleting the localthumbcache.package file
• Using the “Log Installed Files” utility under RPO Special Actions > Utilities

Error Code 102 When Loading Saves?

This indicates missing or outdated modules. The solution is to:

1. Re-download the entire RPO collection
2. Delete outdated versions of Lumpinou’s mods (especially legacy WooHoo Wellness files)

Conclusion: Is RPO Worth It?

After extensively playing with the Relationship and Pregnancy Overhaul mod, I can confidently say it’s transformed how I experience The Sims 4. What was once a somewhat superficial simulation of relationships and family life has become a rich, emotionally nuanced experience that genuinely reflects the complexity of human connections.

Yes, there’s a learning curve, and yes, you’ll need to decide which modules feel right for your gameplay style. But if you’re looking for depth, realism, and storytelling potential that the base game simply can’t provide, RPO isn’t just recommended – it’s essential.

Have you tried the RPO mod? Which modules are your favorites? Let me know in the comments below and stay tuned for more Sims 4 Mod Updates and Guides!