I've stayed in numerous youth hostels around the world, including the Netherlands. Never seen any displays of nudity like these pics posted here! A number of times though, I've witnessed girls going topless or botomless very briefly whilst they get changed. One hostel dorm in Spain I stayed at a few years ago I witnessed a few girls getting completely nude whilst getting changed.

P.S hjrdee, what's the names of these hostels in Ireland which have these unisex shower rooms?

Newquay
 

I stayed in a hostel in Newquay. I walked out of the room then after a few minutes I walked back in. To my delight, a woman was standing there bottomless with her bare bum facing me. She quickly put her knickers on which were pink lacy ones which still highlighted how pert her bum was. Of course then she managed to get her jeans on. End of the view. I got to know her over the next few days as friends but this incident was never mentioned.

I stayed at a hostel in san fransico that was co-ed

This is something typical amercians think are going on "in europe" hahahaha, i have NEVER ever seen something like that...