Electoral victory brings a surprising consequence: the winners look at porn

From The Economist:

When Barack Obama won the American presidency in 2008 his supporters cheered, cried, hugged—and in many cases logged on to their computers to look at pornography. And, lest Republicans crow about the decadence of their opponents, precisely the obverse happened when their man won in 2004.

That, at least, is the conclusion of a study by Patrick Markey of Villanova University, in Pennsylvania, and his wife Charlotte, who works at Rutgers, in New Jersey. The Markeys were looking for confirmation of a phenomenon called the challenge hypothesis. This suggests that males involved in a competition will experience a rise in testosterone levels if they win, and a fall if they lose.

The challenge hypothesis was first advanced to explain the mating behaviour of monogamous birds. In these species, males’ testosterone levels increase in the spring, to promote aggression against potential rivals. When the time comes for the males to settle down and help tend their young, their testosterone falls, along with their aggressive tendencies.

Something similar has since been found to apply to fish, lizards, ring-tailed lemurs, rhesus monkeys, chimpanzees—and humans. In many of these animals, though, there is a twist. It is not just that testosterone ramps up for breeding and ramps down for nurturing. Rather, its production is sensitive to a male’s success in the breeding competition itself. In men, then, levels of the hormone rise in preparation for a challenge and go up even more if that challenge is successfully completed. Failure, by contrast, causes the level to fall.

More here.