Alright, since none of the other women are saying it, I will, it's got NOTHING to do with jizz, I find the stuff revolting to look at, seriously. I want to know what it's like to have an EXTERNALIZED organism. I can't think of any other way to explain it.
Whether by yourself or with another person, for women sex is more receptive and internalized. For men it's more externalized and projective. I'm VERY curious as to what the difference is in the experience itself.
I can do many, many things men do and relate to the other things and imagine them well enough. I can wear men's clothes, go to the places men frequent, participate in "male" sports. If I was really ambitious I could manage the whole stand up peeing thing. But I will NEVER know what it's like to really be the fuck-er instead of the fuck-ee.
Oh, the other thing, most women need a mirror to properly see our genitalia. The idea of just looking down and BAM there it is. It's just ... amusing?
I think most of us want the sexual experience because we want to know why men chase generic "pussy" so relentlessly and make it such a focus of their lives.