Limit your time on the bike. Sitting on a bicycle seat for more than 30 minutes at a time — especially if you also wear tight bicycle shorts — may raise your scrotal temperature and affect sperm production. If you bike, choose a bike seat that's not too hard or narrow, and make sure it's adjusted to keep weight on your "sit bones." While you're biking, stop for frequent rests.

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Stay cool... increased scrotal temperature can hurt sperm production. Hot work environments, tight underwear, prolonged sitting and use of laptop computers directly on your lap can all increase scrotal temperature. A fever also can affect sperm production and quality.

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Avoid lubricants during sex. Personal lubricants, lotions and even saliva can interfere with sperm motility. Instead, use vegetable, safflower or peanut oil.

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Avoid certain medications. Anabolic steroids, antibiotics and certain medications used to control chronic conditions, such as high blood pressure or inflammatory bowel disease, can reduce your fertility. Anti-androgens used to treat prostate enlargement and cancer interfere with sperm production. In addition, chemotherapy drugs and radiation treatment for cancer can cause permanent infertility. If you're considering cancer treatment, ask your doctor about saving and freezing your sperm (semen cryopreservation) beforehand.

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Watch out for toxins. Workplace and household substances — such as industrial heavy metals, pesticides and chemicals in solvents — may affect sperm quantity and quality. Use protective clothing, proper ventilation and face masks to reduce the risk of absorbing toxins.

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