In the famous musical of the same name, hair was looked at as sign of rebellion. Hair was both a symbol and sign of freedom. It's always astonishing how times change and how the sensibility of a culture is reflected to by a host of new manners and mores.
While it's a lighthearted and funny story, the play does carry some complicated issues related to identity and sexuality. For these characters -- and the show in general -- there's usually more than meets the eye.