Personally, breast size doesn't really matter. Not to say there aren't other things I consider in a woman, though. I mean if I am not attracted to someone it isn't going to work. And evidence seems to suggest that we have very limited control over what we are attracted to.

To the root question, as far as gender biology goes, I researched this for a little while. Read quite a few papers. Looked into some journals. The only things I was able to firmly conclude were: A. Men are typically larger and stronger then women, including a somewhat larger brain, (though no evidence I read was able to conclusively link the size difference in the brain to any difference in intelligence.) B. The mathematical/spatial thinking areas of the male brain are more developed than the females. C. The social areas of the female brain are more developed. D. Female left and right hemispheres of the brain are better connected than a male's, leading to, (on average,) better multi-tasking and possibly an ability to 'put two and two together' whereas mean lean more towards single-mindedness.

I found nothing to prove men had a significantly higher sex drive as is often accepted, (even though there could be solid evidence out there saying so,) and I found nothing solid on differences concerning ambition or career goals, (as some sources suggest women are more rarely seen in corporate positions because they have less of a desire.)

Of course, my studies were purely out of personal interest and although four years of policy debate did hone my ability to find good evidence/know when to trust sources better than many, my conclusions are far from professional. But it is what I found, so here are my findings Deery. /: