It's the Environment, Stupid.

Here's a good article describing environmental impacts on our reproductive health. It mentions PCOS.

This article presents a good theory--that the environment impacts our reproductive health--that I have believed in for a long time. You want more proof? Just think of the ways in which maladies such as PCOS didn't exist a century ago. And these aren't things that were prevalent but ignored, these are things that were not as common.