Men's Issues
About 35 percent of fertility cases can be traced to a problem in the man, and an additional 20 percent to a problem in both partners. The following is a partial list of risk factors that may contribute to male infertility:

Being a smoker: Smoking impairs the ability of sperm to move (its motility).
Using alcohol: Having more than one or two drinks a day can affect the quality and quantity of sperm, lower testosterone levels, and contribute to erectile dysfunction.
Taking illegal drugs: Cocaine or heavy marijuana use may temporarily reduce the number and quality of sperm by as much as 50 percent.
Taking prescription drugs: Some medications, such as those for ulcers or psoriasis, can slow or prevent the production of sperm.
Being exposed to toxic substances or hazards on the job: Chronic exposure to elements such as lead, cadmium, mercury, hydrocarbons, pesticides, radioactivity, and X-rays may have an impact on sperm count and quality.
Exposing genitals to heat: The frequent use of saunas, steam rooms, hot tubs, whirlpools, and hot baths can temporarily impair sperm production and reduce sperm count.
Having certain conditions or illnesses: Men with a history of prostatitis or genital infection, mumps after puberty, surgery on their hernia, undescended testicles, or scrotal varicose veins (varicocele) may also experience a decrease in fertility.

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