[Trev]

I guess you mean a new site, just opening? It depends largely on the niche. If the pics are hard to find, you can have a lot less than a random 'babe' site. (I mean hard for the surfers to find) It also depends on how much video the site has. Video is more important now, as more and more people get access to broadband.

In short, you need enough to not invite chargebacks and immediate cancellations. But more importantly, you need a frequent and steady update schedule, to give them a reason to stay around.

my 2c, anyway.