From TWoP:

"Meanwhile, Charmaine is the Rush PM because, as she puts it, she knows "a little bit about salons," and "the three guys" on her team don't. I don't know if she's ever met the guys on her team, but...that is disingenuous at best. The only reason Tarek would miss a trip to the salon would be if it cut into his busy preening schedule, and Michael...I don't even want to think about what kind of regimens Michael puts his body through. Even Lee takes care of himself. I think, given the overall tone of this episode, that it was a three-way masculinity détente where none of them could admit they'd ever been to a salon, or had their hair cut, or even heard of haircuts, or even that hair existed, because that would make them gay, so it was up to Charmaine to jump on the big gay grenade and admit that hair salons do exist."