There is a big case to be made for how one would even go about "gamifying" sex as well as a business case for whether it is worthwhile to spend development time doing so. In the case of action/violent games, the challenge is obvious, the entertainment is derived from beating the challenge based on player skill. A shooter will challenge hand-eye coordination, spatial and situational awareness, quick thinking and an understanding of the game's rules with a clear success or failure state.
How would a game about sex work? Is it a series of conversation trees? It might be interesting insofar as different prospective lovers/friends personalities can be shown and we can have different outcomes dependant upon successfully saying what the NPC needs to hear. But then this presents the issue of "agency" that social justice wanke...warriors would jump on and for once I personally may even agree.
What would the challenge be? Is it entertaining? Can a whole game be made from that premise, or is it just a subplot in a wider game world (f.ex BioWare)? Who would buy it? Who could play it? If it takes so much money and development time with a tiny potential market, is it financially worth pursuing vs. the opportunity cost of making something else?
Personally, I'm not that interested in a game about relationships, first love, coming out, discussing sex or sexual health, pregnancy, STDs, consent, or the challenge of being from an "oppressed" minority. At least not as the main goal. As subplots in the background of a larger narrative, no problem, but a game needs to be challenging and entertaining and I'm not sure the medium is the right one for these stories. They work well in a passive medium like TV/film but games should be player driven, else we're just passive observers and may as well be watching the TV. Nothing against nudity, but what is it bringing to the game, is it necessary for the game and who would buy it?