Men are also more into styling products than they would like to let on. They aren't afraid to use them, but don't like to advertise that fact to their friends. They know that to achieve perfect celebrity hairstyles, takes time and money and they are OK with that.
If you have a man who isn't taking great care of his hair, or is in dire need of a makeover, it may be a great idea to mention to him which celebrity hairstyles you like. If he doesn't seem to be paying attention, you may want to accompany him to his barber appointment and quietly suggest it to his barber instead, that may work better.