sexuality is something that is almost never touched upon in RPGs, though it is seen in love adventures, and not always the H variety. Even then, it's rare that it's presented in a meaningful and mature fashion.
Sexuality comes up in Albion, with various degrees of maturity and Germanity (which is like maturity but more your-mileage-may-vary in the sense that... well, if you've ever played a German RPG before... Well let's just say that Germans apparently loves them some random T&A). More mature when discussing Iskai sexuality. Less mature when you get a quest to get a magical viagra for some king. This is also the quest where the Blatant Christ Figure joins your party, and he's mute and falls in love with the catgirl in your party after they mindmeld. As I said, Germans.
I remember there was a game where there was alcohol you could drink, and it would raise your strenght, but give you a side effect after a while, can't remember what it was...
Speaking of Morrowind and h-games and love, though, that's the weirdest thing about the Morrowind modding community. Sure, there are sex mods. Some interactive. And there are mods that let your player character fall in love and get married.
Where it gets weird is when you consider the sex mod that lets you get another character pregnant and then proceed to raise a family with them, or all the adoptable children NPC mods. There's a VERY sizable portion of the modding community that's into these family-raising mods. I have NO idea what to make of that. Is it nerdy? Touching? Sad? Just an example of really meticulous roleplaying? There IS a difference between endless adoration magical instant girlfriend mods and... child-raising mods.
I still don't get why romance is seen as a necessity in a lot of RPGs, though. Or, well, why romance subplots have such a huge role in everything. Yes, sure, I get that if you end up traveling with people for that long you'll start caring about them but that's DIFFERENT.
That's why I liked Meis in Thousand Arms. He was a player and had no shame about it.
HMMM now who does that remind us of !!