You will find strong (and sometimes uncivil) opinions on this, both ways. I simply prefer it without the apostrophe, thinking that the washroom doesn't belong to the gents or to the boys, but rather is for their use . The same argument comes up with a sports team: are you going to the Yankees game tonight?
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AnonymousOn a similar note..On a pricelist for a barber for example should it be gents' haircut or gent's haircut? I have even seen it written as gents haircut.In this context "gents' haircut" seems better to me. "gents haircut" is wrong (this may be more obvious when you consider the analogous "men haircut").