8th Deadly Sim
Object and skin downloads, some with sexual or violent themes. [Membership]
Albino Sim
Some skins and original objects available, some with emphasis on albino characters.
EZ Board: Gay Sims Club
Message board community for gays, lesbians, and the gay-friendly. Restricted to 18 and over, since explicit discussions sometimes occur. [Free membership]
Openlea's Mature Sims
Many original objects here, some require a donation to obtain.
SimSlice
Many original objects with new animations. Some objects require a donation to obtain, but most are free.
The Nude Sims Page
Adult Game Reviews provides naked, tattooed, and lingerie-wearing skins for females and males, the anti-censor patch, and some screenshots.
True Sims
Original, realistic female nude skins for all skin colors, including anti-censor patch.