My boyfriend and I have been having unprotected sex and have been using the pull out method. I have never gotten pregnant, nor did I have any scares. He tells me that sperm is only in the "pre cum", obviously before ejaculation, and that if you pee anytime after you ejaculate, it flushes the sperm out of the penis. Therefore sperm is not present while having sex. So what are your opinions and do you think it's safe?