i'm with the person above me...dude there is no assurance of non pregnancy unless you just don t' have sex. so please don't fill people with these ideas becasue i feel sorry for the first person that tries this and finds out th ehard way it doesn't work. even if a doctor tells a chic or a dude they could never get pregnant, that doesn't mean it won't happen so this is even more of a chance of getting someone pregnant.