The female to male yoga student ratio

Just a fleeting observation here, but I wonder why the ratio of female to male yoga students in the classes I have attended is so high? My guess is that on average there are eight female students for every male student, but it may be a little lower, perhaps 5 to 1.

But even at that rate I wonder why so many more women are open to yoga than men? Is it just this area (Kentucky), or is there something about yoga that attracts more women than men?

(Also, I should add that when I say 'yoga', I am specifically referring to privately-taught yoga classes like Iyengar or Bikram yoga, as opposed to some of the larger, more commercially-oriented yoga classes you might find at a local gym or exercise facility.)

I don't know the answer, but I am curious about it.