Too many attractive males, and evolutionary pressures start to select against the best-looking

Researchers genetically engineered a group of male flies to release highly attractive pheromones and then released a large number of them into a colony so that they greatly outnumbered average males. Predictably, the females went for the sexier flies — at least at first. After seven generations, however, the numbers of attractive and average flies had leveled out. The authors conclude that being overly attractive must carry a disadvantage. This probably explains why attractive human males have not driven unattractive males out of existence. My own suspicion is that unattractive males are better protected against some diseases than their more attractive competitors.

Hat tip, hbd* chick!