Degrees of Lewdity is another sandbox game that is mechanically similar with stats building but heavier taboo emphasis includings things like:
- SA
- Beastiality
- Parasitism
- Lactation
- Mind Control
A bunch of these things can be toggled and switched off if you’d like but the SA element is pretty unavoidable from what I remember. It has several established potential love interests and campaigns/long questlines and is also regularly updated though not as frequently.
One feature that I enjoyed was the character pixel art so you can visualize your outfits, the lewd state you may be in and sex scenes.