From Geoff Harding, Sydney, Australia
There may be many lifestyle factors affecting sperm count and quality. Among those not discussed are alcohol, nicotine and anabolic steroid use. The problem with correlating sperm data with these factors in a large survey is that an honest admission of the degree of consumption may be difficult to obtain. In addition, stress can have a negative influence. It may be that all the above partly contribute to lower sperm counts and motility.
