I've talked about this in the Discord at greater lengths than in here, but I'll give you a sumary.
As part of The Institute "sandbox-y" systems that I'm doing, I'm making some progress with the new sex system. When in The Institute, you'll get to manage your captured enemies and use them to have sex, either with each other, with other unlocked game characters (available in the future) or with yourself in 1st person. This video shows two captured enemies spawned in The Institute having sex with one another.
I'll make a variety of sex poses for you to unlock. Each sex pose includes around 10 different animations for the character itself and for another extra character, in case you want to spawn them.
This sex system will be less involved than the previous first person sex system, so that you don't have to worry about controls anymore. The only thing that you control (as of now) is a slider that sets the speed for the animations. With this mechanic you will be able to determine the intensity of the sex.
Edit: I should mention, the voice acting for sex is temporary. I'll eventually (not so far in the future) cast a new actress that better matches the original voice acting you're more familiar with.