The sexes or genders have no gameplay effects, they have sex to generate power for the evil buildings! So basically if you zoom into the orgy you can find whatever you like: gay blowjobs, straight rimjobs, whatever.
The player can't do micro-management to control the sex animations, so far they're just cosmetic cause it could make the gameplay too complex for the player. But I do have a seduction system where you need to show sex to some NPCs with the right creatures in order for them to join you. Basically: show them you can fulfil their kinks :3
Also in the future (if this project is not a financial failure and a total defeat ^^' ) I'd love to add mythical creatures to befriend for more weird sex like trolls, centaurs, ghosts, etc...