I'm pretty sure its bunk.

Birdgirl made a post about it, she said lots of things affect your sperm count, I believe, but for the most part its not a drastic change. Hey, things like wearing pants that are too tight will affect your sperm count, if weed affects it, fine by me, as long is its not killing a ton of my men. You only need 1 to get through anyway.
Frivolous248 Reviewed by Frivolous248 on . Amotivational Syndrome, Low Sperm count. What I want to know (mostly from the older heads with more life experience) how do you think marijuana ACTUALLY affects people as far as being a "burnout"/amotivational syndrome and also about the low sperm count thing. I did a little research but it's almost all bullshit. Either it's whacked out hippy bullshit like "weed can cure any ailment" or whacked out right wing shit that says weed is 5 times more deadly than cigarettes and it makes your balls shrivel up and steals your soul. Rating: 5