Having fun! I might suggest player/npc likes and dislikes, and the ability to let your partner know you're having fun (ie moan louder buttons? idk lmao)
Viewing post in Course of Temptation comments
The player has the ability to unlock 'inclinations', by trying out different things and finding themselves in different situations. All NPCs have their own inclinations, which will affect their decision-making and how the game makes them act (e.g., I have only ever had Forward NPCs accept a proposition if you approach them in the showers).
The new update has also just released and has a few different things you can choose as turn-ons and turn-offs (I haven't explored them yet myself), so that's something to be looking at.