When it comes to sex, men are pretty straight-forward: our concerns largely center on when we can do it, and if we perform well enough. For women, there are two large factors: the physical ability to enjoy sex, and the mental willingness to do it often or not. Hopefully as I get feedback and users, I can create a more "complete" survey of how women approach sex.
I want you to suspend any notion of perfection, or emotional considerations. This is more or less about mechanics and logic. If its any way off-putting, its certainly not intended as so.
If you want to study up on things some more, check out http://myvag.net/sitemap/ or http://www.woomb.org/bom/index.html : those are very useful resources.