mmovsg.net has a small selection of LGBT sex games within its larger library of free online sex games.
adultgamesnews.com reviews and provides links to some of the highest quality gay and lesbian sex games around. Unlike most sites, you can read the review on the same site before you decide whether or not it's worth your time.
69games.xxx has one of the largest selections of animated free sex games for lesbians.
newgrounds.com is a predominantly general sex game site, but some LGBT sex games are on offer.
comdotgame.com offers up 4 pages of lesbian sex games, from live-action to animated.
mycandygames.com has one of the most impressive collections of Lesbian sex games around.
2games.com features a one-off jack-off LGBT sex game called Gay Cum-O-Meter, The goal is rather simple. A naked gay man stands in front of you, and with your mouse or trackpad, you must grab his dick and stroke it in different motions at various stages of his erection, until the cum-o-meter can't handle the pressure anymore, and he shoots his load. It's a mess.
humplex.com presents the HUMRcade, a gay arcade full of over 80 games dedicated to one archetype. From the super hero, to super villain. There's the construction worker, and of course a fireman. The site suggests that you could have blue balls from searching for LGBT sex games, which considering our research, seems like a reach, but they definitely have assembled an impressive library.