You contract with an outside firm to do the interviewing, screening, etc. On the other hand, a completely separate HR department gathers the prerequisites of the hiring department or manager, and then they make the decision as to whom to hire. The manager is given a new worker with no biased input as to race, gender, sexuality, attraction, etc. I think it goes much further than simply having a workforce that works well together, and likes to hang out with each other. The attractiveness of the candidate, and whether or not they'd be fun to hang out with on the weekends, or worse, date, should have zero bearing on the hiring process.

Check out Malcolm Gladwell in his book "Blink" discussing blind auditions for musicians.

Also: http://www.theguardian.com/women-in-leadership/2013/oct/14/b...

People might cry and complain, but why not text based media like chat or email? Chat for real time related things, email for other.

Or voice scramblers, but that's just silly :)