Male or Female

I love it when I can't decide whether someone is a man or a woman. I think it's so funny. You whisper to the person sitting next to you, and try and work it out. So I thought of an idea for a website. It would be like hot or not, but for people you see who you can't guess what sex they are. Take a picture of them with your phone, send it to us. Visitors to the site get presented with pictures and they have to guess simply MALE or FEMALE. Then they get to see roughly what other people voted, and maybe roughly how long people take to choose. Pictures which are hardest to work out become more popular.
A bit like FEMALE or SHEMALE...