Given the developer's proclivities, it's pretty unlikely that there'll be official ones. But the game has some pretty awesome mod support, and I was also interested in this, so I'm presently working on a mod to add systems for futa enemies and similar ones that have their way with the player somehow. You can join the official discord if you want to check it out, I have a mod thread going. Not too far in yet though, I just have the first version of the 'sex' framework, and the first bandit enemy done. If you have some coding experience, you could also relatively easily make your own using the framework too!