He claims to have done it with three women in the past and he had sex with each spanning months. (He's very sex-driven) and I'm wondering if these women were lucky NOT to get pregnant/maybe were not very fertile or if my boyfriend's precum doesn't contain much sperm. I would like to try it out as an added method of birth control but I'm still borderline about it. What do you think? I don't think all women are the same so I would hate to be the one woman who he gets pregnant with precum. Do you think his precum doesn't contain much sperm?