/jp/ - Otaku Culture

>>46967764
They are extremely rare; the only ones I'm aware of are the PS2 Negima games and the Sega Saturn Tenchi Muyou games.
I haven't played any of them extensively myself, but as far as I know, they don't any actual sex scenes, and the 18+ ratings are just because the software ratings boards had it out for them.

Adaptations that put characters in sluttier situations than the source material isn't unheard of though. There are examples like Queen's Gate Spiral Chaos, which has characters like Lili from Tekken stripping.
Netori is also surprisingly common; there are a lot of games where heroines can fall in love with you instead of their original love interests. Yu-Gi-Oh Tag Force is famous for this. (I can only speak for myself, but these are just as good as H-scenes for me. Taking a heroine I've been in love with for years for myself, hearing her confess to me... especially when I don't see it coming, my heart pounds out of my chest so hard it feels like I'm going to go into cardiac arrest.)