Erotic computer games. These usually show sexy pictures, the better you play the game, the more of the picture you get to see. There are also interactive sex simulations, or other variations.
Computer games played in your Web browser are listed in http://dmoz.org/Adult/Games/Internet/Online/, all these have to be downloaded.
If your site carries or discusses software for non-handheld devices as well, please submit to the Computer category instead.
While The Sims game from Maxis is rated for all ages, fans have created modifications and add-ons that are decidedly adult in nature. Others have managed to create screenshots of Sims in compromosing positions.
Any Sims-related site with substantial adult content should be listed in this category.