Don't forget: there are two parts to your package. You already go through great lengths to protect one (your penis), but sometimes neglect the second (the nuts). If you want to ensure healthy sperm and a vibrant sex life, start showing your testes some TLC, stat. Here's how.

KEEP THEM COOL

A laptop on your lap raises your balls' temp, which may harm sperm quality, a Fertility and Sterility study found. Set devices on a table, says MH urology advisor Larry Lipshultz, M.D.

HIT THE SACK

Less sleep means more stress hormones, which can sap sperm production, says Tobias Kohler, M.D., M.P.H., F.A.C.S., an associate professor of urology at Southern Illinois University.

EYE THEIR SIZE

Older men with a testicular volume of 20 milliliters or more risk heart troubles, a Journal of Sexual Medicine study reports. The authors say blood vessel damage may up testes size.

GET A SAFE SNIP

A vasectomy won't cause ED, a new study in the Journal of Sexual Medicine found. That is, unless you have sex within 72 hours. The possible pain or bleeding could leave you limp.

MOVE YOUR PHONE

Numerous studies have linked cellphone exposure to decreased sperm count and quality. So keep your phone in your back pocket instead of in the front one, says Dr. Lipshultz.

KILL SPIDERS

Dilated veins in your scrotum, which are similar to spider veins, may cause infertility and testicular shrinkage, says Dr. Kohler. Schedule an appointment with a urologist.

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