My old great aunt had a rather crude maxim about going to extremities - one that's come into my mind more than once on reading this thread. 'There's a difference between farting and tearing your arse!'
The extremities bits are the roast chicken, blowdried 'foof', and the naked down-dog pose. I laughed like a drain at these, whilst also taking them with a large pinch of salt, but will admit that IF true they are indeed gratuitous, 'tearing your arse' territory. I sauna naked with a large gym towel around me and apply moisturizer as the chlorine dries out my skin. I mainly use it on my legs anyway and don't make a public display, but if you want to apply it all over then knickers are going to get in the way. It's gym etiquette to use towels in saunas anyway, but a lot of people keep their swimwear on and don't bother.
A woman sitting naked on a gym bench would probably escape my notice. If she really had been rubbing her lady bits up and down the furniture then yes, this would have raised a querulous eyebrow. Scenario 1 is farting. Scenario 2 is tearing your arse.
As to the smaller stuff, and the horror expressed upthread about the sight of a naked woman (presumably in an all-female changing-room), I really also don't compute the British (and US - at least the East Coast) hang-up about nudity. Yes, it does seem to stem from misogyny. As for that ancient, disgusting and wrong trope about women's anatomy being fishy, that's about as insulting and gratuitous a form of woman-hating as you can get. It's usually men who use it, but not all misogynists are necessarily men.
It started out as an entertaining thread, but has certainly turned a bit strange.