If you've been aching for an adults-only social network, San Francisco-based Zivity may offer some release. Billed as a mature site for connoisseurs of provocative photography, Zivity will host shots from a selection of scantily-clad models. Like HotorNot, users can then vote on the appeal of particular photographs. Subscribers can even leave messages for the vixens on display — a feature that will surely show off the maturity of the community. Zivity paints itself as a classy boutique where its members can enjoy fine photography. Unfortunately for the models, users aren't actually screened for taste; like most porn sites, all one needs for membership is a credit card. Zivity has raised $1 million for what — loser-generated content about soft porn? The models get a cut of the action, but if they have to put up with Internet commenters, we think they should hold out for stock options.

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