From: "Exposing Marijuana Myths: (The Lindesmith Center)" page 93;"Studies of men in the general population have also failed to find differences in the testosterone levels of marijuana users and nonusers. "There is no convincing evidence of infertility related to marijuana consumption in humans. "There are no epidemiological studies showing that men who use marijuana have higher rates of infertility than men who do not. Nor is there evidence of diminished reproductive capacity among men in countries where marijuana use is common." Hope that answers some questions.