Since running a site like yours is actually what I used to do for a living, I guess I am qualified for this one
My initial reaction would be to spice up the enter page a little bit, but if you change pictures on it be sure to keep one where you are smiling.
Make the agree/enter button stand out more.
I agree with the others . . . don't see why you are popping so many windows.
Last, your free tour flows wrong (to me anyway). The first page is about your webcam, but then you have all the other crap about other girls and couples. I'd move that to the VERY END of your tour, so that all of YOUR webcam, video, and picture stuff comes first. Most guys joining your site do so because of you - not the extras
Anyway, hope that helps.