Seems like it would help keep the shorts from getting stinky.

Edit 1: friction is the answer

Edit 2: sorry for this edit – i was trying to make a new post, but Blorp for some reason took me to editing this one instead. Trying to put it back the way it was…

    • sem@piefed.blahaj.zoneOP
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      15 days ago

      I have lots of underwear, only few bike shorts.

      I wear underwear to protect clothes.

      I don’t wear underwear under underwear because i don’t need to protect it.

      So it must be a different reason from that.