There's no evidence that the changes in gene expression that cause steroids to increase your protein synthesis affect the rest of your DNA. In other words, the genetic influences that determine whether a man spawns a boy or a girl aren't connected to the genetic influences of steroids.
Yes, this is another gym myth that comes up at least once a year.
Did my first cycle in late 1994 (yes, I'm old). During this my gf got pregnant and out came my first boy. I was running cycles in late 2003, late 2004, and summer 2006. The result--you guessed it--3 more boys. A friend of mine is the same way--5 boys--around or after cycles and his are with 3 different women.
My first was a boy, I was on cycle then but also taking HCG.
My wife is pregnant again right now and according to the ultrasound was conceived almost to the day I began my PCT, which of course included HCG but obviously the gear was still present in my system if it was at that time. But I have a feeling it might have happened earlier when I was fully on. Not sure of the babys gender yet, wont know until birth.