I thought this all through high school too. Then I went to college and my poetry creative writing classes were actually more guys than gals. And once you immerse in the genre, you realize there are actually a lot more popular men poets than women. However I think your peers and your current vantage point can really make it seem otherwise. I remember thinking that poetry was not a form of writing that one could do "seriously," as in, that one would be taken as a serious writer if one wrote poems. Quite the contrary in fact. I never thought literature was a male dominated field until I got really, really involved in it. You should check out the VIDA count. It tracks women in literature, especially publication rates for women vs. men in magazines. Of course, it doesn't look at the rates for all magazines ever, just what I suppose are considered "major" ones. I'm all for anything near parity, even 40/60, especially with fluctuations. But the ones that are consistently publishing women in a marked minority bother me. Except poetry. Seems like there are a lot more women there too.