Do you chat with them prior to meeting? Or do you already know these people?

I did significant amount of online dating in search of Mr. Right. I've met or talked to many nice people who never even mentioned sex. But I was approached for online sex once. It was during a chat. It was not okcupid. But it was also one and only chat I did on the dating site. Maybe that's the answer. They think that woman is on a chat to do online sex? At the moment I wasn't in a good place and actually didn't need to be dating so I guess it was expected I'd attract a creep.

What type of men are you going for? Are they educated? Professional? Over 20? Why are they on a free site? Free sites are usually indication.