You know, somewhere there is a forum where some gal is asking the same question about breasts. And there are big breasts, small breasts, gorgeous breasts and ugly ones too, you can mix and match: big/ugly small/ugly small gorgeous, ad nauseum. I guess the same goes for cocks too. From my experience and discussions with ladies, some friends and some more-than-friends, the head is an important factor and I take it that a robust "roman helmet" is a good thing.
This would be an excellent opportunity for the ladies to chime in....
RockstarParkingDude: don't know if there is a rule, but I guess there are some ugly cooches out there-personally, I like 'em not too floppy, but with some definition in the labia :-0