Besides, women are naturally more modest than men. We have a hot tub in the locker room at our health club, which is meant to be used naked. I have only seen it being used about three times since I have been a member. My husband says the men use theirs all the time.
Hygiene and clogged filters were the reasons given. Neither one holds up. Girls one-pieces were more likely to clog the filters, but that didn’t count. As for hygiene, there are many ways of ensuring good hygiene, and they shouldn’t be restricted to a fraction of the users.
And as for your other justification:
“Besides, women are naturally more modest than men.” Did you ever think that women/girls are allowed to be more modest than men? To get your eyes opened, read Joel Sherman’s Patient Modesty blog.
Growing up I heard all kinds of generalizations (always from women) on the subject: Boys are all the same. Girls aren’t interested in boys bodies. And on.