I can't think of one that has actual sex right now (though I've been playing through NSFW games lately), but Super Lesbian Animal RPG has commands to kiss your girlfriend

Tank and DPS? Naww, that shit is angry. Tank and healer? thats some good stuff

There's dozens of games with that mechanic on on F95 alone. Surprisingly rarely does it make for compelling gameplay, disappointingly...

Made me think of this manga, which basically does have a say gex buff.

Haven't played but I'm pretty sure there's a tabletop RPG called thirsty sword lesbians that does this...

Okay, not video games but:

Bliss Stage

Glitter Hearts

Thirsty Sword Lesbians