Size

We don't. We don't make flow charts, define categories, or make pie graphs. Most of us don't measure, or ask guys how big they are, or even know precise sizes. The numerical part of interest in this topic is 99.99% the interest of men (yes, I'm aware of the irony in that last sentence!)...
 
Men are the only ones worried about their size. Period.

This is the thing that guys here don't get, so I have to think they don't want to get it. Even most women who might consider a little extra a nice bonus, don't make decisions about who to be with based on that, and certainly don't stay up at night wishing our partners were bigger. So yes, I would agree with you, men are the only ones who worry about their size (and not all guys - a lot of guys who get it don't worry about it).