Is there a way to produce more sperm?

Incidentally there are several factors that can contribute to a low sperm count. The testicles should always be kept as cool as possible, because raised temperatures (as little as 1 or 2 degrees) can result in destruction of sperm. One of my co-workers just took some time off to have an operation that might enable him and his wife to have the baby they've long been trying for. It involved straightening out a natural blockage in his vas deferens (ejaculatory ducts). Moreover, there are medicinal appraches to providing the male with more sperm as well (e.g. fertility drugs).