Emporium has a decent collection of Porn Game Torrents, you could try a category search there.
If you're looking for HC porn then I guess the Japanese games like Sexy Beach 3 might tickle your fancy. Mind you, they sometimes have questionable fantasy themes (Battle ****r, Raplelay) and since they aren't meant for the foreign market sometimes need some tweaking to your system in order to run correctly.
You might want to check out
http://www.hongfire.com/forum/ for more information.
Other fun naughty games I'd recommend: Lula: The Wet Emperium, Singles 1 & 2 and just for messing around Virtual Jenna.
Just look around the various Torrent sites and you'll find plenty.