No underwear is most tactical. That's why it's called going commando.
I've been to combat multiple times and could never get how guys do this. I have to have something on over my cock and balls or I chafe. Badly. I don't know how guys dicks aren't raw from the interior inseams of their pants. There's also ass crack chafing. It's called "Monkey Butt". And it's awful.
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