Mountain dew effects on sperm count

However, scientists have yet to carry out the experiment on human subjects, and there are no known reported cases of reduced sperm count after drinking Mountain Dew. According to the urban legend, the soda lowers sperm count and thus works as pre-coital contraception because of the soda's dye, Yellow No. But experts say it's just that — a rumor. By subscribing you agree to the Terms of Use and Privacy Policy. Rumored Sperm Killer: Smoking. Nothing like a nice, controversial blog post.