Testes

maintenance:

The testicles sit outside the body and even though this makes them vulnerable they actually benefit from being there because they can then be a few degrees cooler than the rest of the body. Keeping the testicles a few degrees cooler is by far the most important thing to do for maintenance.

Be sure to avoid spending excess time in hot baths or showers, avoid saunas and extremes in hot weather. Wear boxer briefs that are cotton or cotton lycra blend. Always wear shorts in summer. Avoid tight jeans. Never sleep with underwear on. -

Also look into AGEs:

http://ouroboros.wordpress.com/2008/07/15/ages-linked-to-dna-damage-in-diabetes/