In the 5 years I have been sexually active, I only used birth control (pill) for maybe 2. Withdrawal has been my primary method of 'protection', and I have been with several men, having sex at least daily. For the last few months, that's gone up to 5-15 (quick) times per day, with one person. I share this information with you in hopes of learning anything really about fertility. Is this normal? Am I infertile, or is withdrawal seriously this effective?  I've never been pregnant, but I have missed periods.