Tips for the workplace

I do not vouch for these tips, but they are interesting to ponder.  Here is one of them:

Choose women who are happy, but they shouldn't smile too easily.
This is hard for men to do. Because men are hard-wired to be drawn to women who laugh at their jokes. Men want to be funny. But women who are slower to smile do better at work, according to communications consultant Neil Lowndes. So you should date women who smile a lot, but work with women who don’t. (Hat tip: Derek Scruggs.)

That's from Penelope Trunk.  I wonder what the implied model looks like.  Is this a coordination game or does a hard-to-mimic smile create a separating equilibrium in a signalling game?  Since men compete against each other for dates, should they not choose a randomized mixed strategy when it comes to female smiling?  (Multiple dimensions have value, even if smiling predicts some of them on average.)  Can a taste for arbitrary markers serve as such a mixed strategy?  Are the eyes the window to the soul?  Etc.