educate yourself on what anabolic steroids do to the HPTA
and there is no black and white answer. plenty of guys abuse steroids and it only takes 1 sperm, while guys don't use steroids and they cry because they can't have a baby
I will tell you right now that if you aren't able to knock up your gf/wife and she really wants a baby she is going to turn on you if you do anything to lessen the chance and blame you for it.