my boyfriend and i aged 28 have just decided to try for a baby but we are faced with a confusing problem, he wears tighty whities not boxers, we have talked about the rumours of them lowering sperm and they hinder chance to get pregnant, he is not going to switch and i respect that and i am not going to force him but i am wondering is there any scientific evidence that tighty whities kill sperm and thus hinder chances of having a baby?