What contributes to sterility or low sperm count? What can I do to increase it?

For the most part, Tight clothes, constantly masterbating, and some other crap. Build it back by eating healthy, and be sure to drink lots of water, too.

What did your doctor tell you when you went in for the sperm count test?

I've heard that smoking, drug use, and wearing the "tighty whitey" type underwear all decrease your sperm count. I've also heard that sperm counts are higher in the morning, and that having sex every few days (not every day) can help. Also, eat a balanced diet and exercise…stay healthy.