Why do men go commando

Men go commando for several reasons:

• Comfort: some of us can't cope with our dangly bits being cooped up in hot an sweaty underpants. Even boxers don't work for us.
• Healthier sperm: human testicles evolved to be outside of the body for a good reason, and that is temperature. You can google for studies on this yourself, but it has been shown that men who are already struggling to produce viable sperm only make it worse by wearing garments which constrict the testicles and keep them warmer than they should be.
• Erotic reasons: far easier access for self and for your partner!