I got chatting to a girl in a bar last night and after buying her a drink I said, "I think I should tell you that I suffer from premature ejaculation".
"I admire your honesty", she answered, "But I only met you ten minutes ago, there's no guarantee that I'm going to have sex with you".
"Oh, I know that", I replied, "I just didn't want you to think that I'd wet myself."