Do you ever play H games or Dating Sims? If so, which is your favorite?

Not really, but I played a few in the past. These stick out in my mind:

Battle Team Lakers: play some fairly easy grid-based RPG battles and watch some sex scenes with girls with rather large bosoms between levels.

Metal & Lace: Play a terrible fighting game, watch a strip show between levels

Knights of Xentar: A cheezey RPG full of sex scenes and Samurai Pizza Cats-style localization where every line of dialogue made fun of everything in a slightly funny manner…. And really odd CD voice acting where the hero sounded like he was 12 years old for some reason.

Viper GTB… simple dungeon crawling with the occasional fight that amounted to "use the secret special move over and over" but like most Sogna games all the sex scenes are only viewable if you lose the game and it's all RAPE RAPE RAPE blegh

Ryoki no Ori II… from the Dokyuusei team (I think) and enploys the same strategy of "be at the right place on the map at the right time" which is impossible if you don't know Japanese. So I kept getting the bad endings. And since this was kind of a horror game, it often involved the female character getting killed horribly. It was pretty depressing and not sexy at all.

Of all these I'd have to say my favorite was Metal Gear Solid II where Raiden runs around naked.