Scarlet Slayer
Action RPG game where you play as a sexy vampire hunter fighting sexy vampires, and also having sex. All this hot sexiness has courted a bit of controversy, because won't someone please think of the CHILDREN who play this smut?
The game's defenders point out that the sexiness is equal-opportunity (there are sexy men and women, both with a variety of body types represented) and is empowering rather than exploitative.
Despite all the controversy, the game actually has really good combat, with a wide array of cool weapons and powers.
Developed by HeavyTungsten Games, the makers of the Gabriela's Gate franchise.
Not surprisingly, the source of a ton of fanart in certain corners of the OmniNet.