Dear Paul it is not a reliable way to protect it from unwanted pregnancy, because without a condom, the penis entered in the vagina is always considered to be unfairly, because one drop of sperm can also be enough to have a pregnancy. And one more thing, is that, the use of the expulsion method or pull out method doesn't protect against any sexually transmitted disease. Sex without any sort of protection - is never really safe! And to get the more "fertile" dates - you can use a Ovulation Calculator to measure the girls dates - those must be avoided - obviously you must avoid sex those days but just a reminder - this is not a real guarantee that nothing at all will happen - just keep in mind..OK!! Read here: https://lovematters.in/hi/pulling-out-withdrawal-method-pregnancy-chances https://lovematters.in/en/our-bodies/ovulation-calendar-how-to-calculate-ovulation If you would like to join in on a further discussion on this topic, join our discussion board, "Just Ask” https://lovematters.in/en/forum