I like these sites, so you might too.

Collections of games

ULMF - World's largest internet forum dedicated to alternative hentai. The hentai games board has a large community keeping track of the latest indie games. Oh, and I happen to be the person who created it.

TFGamesSite - Indie transformation games of varying quality. A cool game called Trap Quest started its life there.

Similar Games

Tales of Androgyny by Majalis is in my mind the only game focused on the same sorts of themes that is of the same calibre.

Other Resources

Lewd Gamer - News outlet keeping track of the latest commercial adult games from around the world.
ThePornDude - A porn list that reviews the best porn sites in the world!