Would you agree to a date/casual encounter without seeing any pictures? I know I wouldn't. And I'm willing to bet most people feel the same way. There is a HUGE difference between your friend setting you up on a blind date and agreeing to one online. Not to mention that the adult nature of your site makes it even more of a risk. If this is a potential business venture, I'd definitely change your dating model. If you're hell bent on making a casual dating site, there are other ways of ensuring quality and privacy. Profile verification is one way, private/fee based entry is another.