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…
Quick question, does your bike seat have the padded part or is it just the tube?
I am not sure what you mean by “tube”. My seat has minimal padding and is pretty firm. All the bike people I’ve ever met have told me to never get the padded seat, always get the padded shorts.
Mine looks like of like the “men’s recreational” but without the air gap, here:
