As a person who has logged 1000 miles per year on my bicycle.

I see no advantage to riding in the nude.

Quite the opposite, and I'll try to be delicate ...

There are ~things~ that rest upon the bicycle seat.

Those "things" do not enjoy being jounced around. (understatement)

Indeed, I'd proffer that most bicyclists take measures to avoid such "jouncing" of those body parts.

The usual bicycle clothing helps to allay such jouncing.

So, that leads me to ask, what is the purpose of such nude bicycle rides?