It is a large penis support group, however, I believe this site also helps to bridge the (huge) gap between men and women through discussion. Some girls are just here to gawk at big dicks, but some of us are here to learn as well. I know I have learned a lot in the last few months about how the male mind works, and for every woman who understands a man's needs a little better there will be a smoother relationship as a result.
I can only speak for myself but I definitely don't see this as a "hook up" site, so I'm sorry if the straight guys think they're going to score with a lot of the women. I know some have hooked up, but I think a LOT of us are just here to learn, enjoy the view and have some good clean fun.
Support comes in a variety of ways. You could learn a lot from a gay guy, or a bi guy, or maybe someone you wouldn't normally talk to. It's good to keep your mind open.