What's off-limits?

Sperm can be especially vulnerable to environmental factors, such as exposure to excessive heat or toxic chemicals. To protect your fertility:

• Don't smoke. Men who smoke cigarettes are more likely to have low sperm counts. If you smoke, ask your doctor to help you quit.
• Limit alcohol. Heavy drinking can lead to reduced testosterone production, impotence and decreased sperm production. If you drink alcohol, do so in moderation.
• Avoid lubricants during sex. While further research is needed on the effects of lubricants on fertility, consider avoiding lubricants during intercourse. If necessary, consider using baby oil, canola oil, egg white or a fertility-friendly lubricant, such as Pre-Seed.
• Talk to your doctor about medications. Calcium channel blockers, tricyclic antidepressants, anti-androgens and other medications can contribute to fertility issues. Anabolic steroids can have the same effect.
• Watch out for toxins. Exposure to pesticides, lead and other toxins can affect sperm quantity and quality. If you must work with toxins, do so safely. For example, wear protective clothing and equipment, and avoid skin contact with chemicals.
• Stay cool. Increased scrotal temperature can hamper sperm production. Although the benefits have not been fully proved, wearing loose-fitting underwear, reducing sitting, avoiding saunas and hot tubs, and limiting scrotum exposure to warm objects, such as a laptop, might enhance sperm quality.

Chemotherapy and radiation therapy for cancer can impair sperm production and cause infertility that might be permanent. Ask your doctor about the possibility of retrieving and storing sperm before treatment.