I'm a dirty pervert
Adult game is not just 1 genre. I hate all those stupid games where yuo play a game and get a not very well made picture of a naked girl (like most strip poker and games like that).
But I love those good adult game with an erotic theme, like Biing, Farmers Daughter etc
But adult games is also games like Resident Evil, Silent Hill etc
else I voted for adventure (The best genre) rpg and puzzle (bubble