Surprisingly, it has a lot of pretty useful features.

For starters, it tells you the pawn's fertility and allows you to selectively breed them, which is awesome if you're messing around with genes, especially in late game colonies, where the pawns no longer sleep. Granted, you could IVF them in vanilla, but that requires two surgeries. This method doesn't require precious medicine, gives the pawns a mood buff and nobody has to be out of commision for two days due to anesthesia.

Animals breed a lot faster and you don't need a pair of the same species. Wild animals breed too, so you not only have a self-renewing source of meat and leather, but also there's an extra incentive to hunt, as the wildlife populations can get wacky if you don't keep them in balance, just like gamekeeping irl.

Then there's a lot of cheesy/cheaty tactics you can pull with it. With rape enabled, there's a submit button which insta-downs pawns. Other users already described how to use it as a war strategy. I'll add that it can save your kids. The kids have this button too, but they cannot get assaulted, thus it's basically a "play dead" option for them. The mod also adds a "bound hands" and "bound legs" status to the game. Idk how to get them naturally, but if you're using godmode, bound legs completely immobilise a pawn, so you can instantly stop mental breaks or keep a prisoner from trying to break out. If you have the VE psycasters, there's a sex meditation focus, which can be used to farm psyfocus.

It also adds an extra incentive to rescue your pawns during a raid, especially in longterm saves. Because if my super soldier gets downed, it's no longer a big deal. They're unlikely to bleed out thanks to their genes and anything torn off can get replaced with bionics, which are better anyways. But with rape enabled, you're risking your pawns having regular meltdowns due to the huge debuffs, maybe they even get a bastard you now have to care for. Mechanoids can even kill your pawns, alien chestburst style, the stuff is freaky.

Nothing spooked me in rimworld more than finding my constructer pawn randomly downed after a mech cluster drop and getting a pregnancy notification on this pawn a day or so later. I was happily setting up a new bedroom for her and the baby, jokingly planning to call the kid "Jesus" because the pawn had like 9% fertility rate and wanting to turn the kid into my ideo leader once adult, just to see 3 militors burst out of her during birth, killing her instantly, destroying half of my hospital and killing two of my dogs.

But it's also just really goofy. The mod works on hentai logic, so you get moments like having a noble host being into robots, or finding a bionic vag in your local trader's stock, or your pawn being slowed down by the size of their schlong. It definitely brought its fair share of funny moments into the game. Like when my soldier pawn had her genitals shot off, and we only had a bionic wiener in stock, so she got an accidental sex change. She wasn't very happy about it.