Sex as a game-over state in certain types of game. I feel like people who hate that sort of miss the roleplay portion that you'd play a game for, such as build up to a scene or you consciously needing to consent to something (E.g: Giving up to a succubus character in an RPG type game when you could very easily win if you didn't give in to your libido, and consequently losing/dying). If you want the sexual content without the build up or interactive element, why on Earth play a game when there's a billion images or videos out there?
As one of those haters I rarely see that roleplay aspect actually working in practice. Nor does consenting/"giving in" need to lead to a Game Over, case in point
this. Usually you lose non-sexually first and
then get subjected to a scene which is very explicitly written as rape in-universe. Usually a slideshow or a single linear progression of animations too, no interactivity once the sex starts so might as well watch a cookie cutter rape hentai. A lot of these games (especially the platformers) also have terrible Save/Checkpoint systems which makes seeing the scenes a chore and amplifies the ludonarrative dissonance of having to "lose" (be defeated) in order to "win" (have sex) yet "losing" is the easy path.
In line with all of this and much like other rape/corruption games and the like sex is inherently portrayed as something bad, sinful, undesirable or even outright evil which is just hypocritical coming from someone who makes money off of porn games. And you say it yourself: "give in to your libido" as if resisting is always supposed to be the "good" option. Having
options and
opportunities to give in is not a problem, nor are the explicit submission games such as Trap Quest, but it's really grating that seemingly
ALL the "strong" female character games are about sex being bad and complete abstinence being good rather than selective and careful indulgence. Sure you probably shouldn't drink that pink-glowing potion the demon lord handed to you but why do you never get the
option to hook up with one of the good-looking guys in the tavern? Or to walk up to a trio of lvl2 goblins and offer them a good time rather than
having to drink poison, letting them KO you then rape you? And if any consensual scenes exist you bet they're the most bland, uninspired vanilla sex possible. Somehow you can never find a willing partner for anal let alone
ask a tentacled creature to breed you yet once you lose everyone is queuing up to piss in your ass and feed you your own shit before leaving you to the dogs.
Anyway as for OP: pretty much any choice of game or art/render engine. It's always the same too: each engine has certain "low effort" default options which either inherently suck or become stale from overuse while those who invest time and effort or have a creative idea can make something wonderful with any of them.