Steriods?

Ho sorry I think I might be posting in the wrong area, I have been trying for a year for a baby with my partner of 6 years we already have a 3 year old.
I track my ovulation with tests and do the deed every other day but no success. I just found out today that he has been taking steriods! Which I am fuming about! Is this maybe why I haven't fallen pregnant does it kill the sperm? 
Thankyou for any replys.