Not always. It usually happens if they were only interested in the ass. which is stupid, because that ensures no repeats. Or if the person was not emotionally prepared to become sexual.
And it's not just men who are guilty. Women do it too.
On the other hand, if you're pretty well emotionally connected, and ready to take that step it can actually make you closer.
But if you're wanting to play the field, and you choose mature partners, this doesn't happen too often. But it will happen from time to time, and when it does happen it'll hurt, unless you don't really care about the guy. And when it does go to the girl network, that's why it's there. (uh-oh ladies! Your secret's out!) Tell all your friends how the creep is acting. You can even do him further damage by telling them he's a dead fuck or a premature ejaculator. Pretty soon word will get out and he'll have to go to the morgue to get laid. Just remember to put it out there when the guy is a real good guy and a stallion in bed to