My thoughts on sex partners, everyone has different fetishes and different desires, if you want to make a game with a variety of fetishes, when possible make the different characters and fetishes optional, the only one that should be mandatory is whoever the story is pushing as the main love interest, if there is one. I personally have no issues with many fetishes, though I do know how much of a killer it is for me when one of the ones I don't like is forced.
This is no way meant as an attempt to tell the Dev how to make their game, just a recommendation, from someone who enjoys these games a lot.