These button only change the "host character" to male or female.
Honestly, didn't exactly plan ahead... No options for genders or other actions. What if you do vaginal/anal? Use a vibrator? There's a few things. Big assumption there, but I assumed most players would likely have a cock, and just rolled with it... Personally, since I play with toys, I "translate" the messages into different speeds or motions, ignoring it mentions cocks.
Left it be cause the follow up game will be a lot more polished in that way.