I wanted to ask if it may be possible in the future to implement more humanoid penis options such as foreskin and non sheath penises.

The logic and physics for flaccid interactions are already there, so hopefully the latter is not too hard to implement.

As for the former I would like to see it in a format similar to Anthro Heat being able to be somewhat stretched and such, perhaps with length, tightness and thickness sliders; Although i see it as less likely since the engine doesn't seem to have cloth physics or something that could be applied to ease the implementation.