I don't know where you heard that one,but that is absolutely untrue.If someone you know told you that ,please tell them that is not true.I hope that you are not relying on that as your birth control.Get the word out if young women in your area are hearing this information,tell them that this is not true and a sure way to get pregnant!!Go to the birth control forum on this site for more information.Good luck to you.Patty