ok..
something that should fit your niche : premium full customizable adult games
basically you can customize everything: content, interface, help text, game rules etc.
also they have a top10 feature which is the key to start contests giving away prizes like monthly memberships, mugs, t-shirts etc
discounted price : 21 games for $1899
demo page:
www.adultgamestemple.com/gfy.php