You’ll nurture your sperm

Your scrotum needs to be just the right temperature in order to optimize sperm production, says Dr. Steixner. That perfect temperature: 95 to 96 degrees, just slightly cooler than the rest of your body. When your testicles are too warm, your sperm quality suffers, according to a Finnish study that tested the semen of men who used saunas. Even tightunderwear can be enough to raise your sack’s temperature above the optimum level, Dr. Steixner says. So for the sake of your future children, consider freeballing.