Where I am it really boils down to whether or not you start kissing the nearest girl in the club when drunk.

You could possibly explain this in the article then with the idea that intelligent people are more likely to be either really introverted or extroverted and that the introverted ones tend not to do this sort of thing, leaving just the extroverted of the smart people to get laid?

Sort of similar to the risk-aversion idea here, except with introversion. I do have smart friends who do this, they just happen to also be reasonably extroverted