For men who want children, sperm count and sperm quality are important. Considering this, it's understandable that people are interested in what activities and behaviors can be harmful to sperm. There are a lot of myths and rumors about what can affect sperm count, but the reality is that most activities men engage in won't hurt their fertility. To set your mind at ease, we asked the experts about eight so-called sperm killers in the rumor mill so you can get the truth about what affects sperm quality and what doesn't.