@alexander.alexis: Sorry---but girls are more likely to be concerned about the fragility of the external, conspicuously vulnerable appendage, if they notice it at all.
I do remember as a child that I resented my Sicilian mother's insistence that my brother take precedence over me in some circumstances. He was three years older so certain privileges were attached to age. But others, clearly described, were not. These seemed so unreasonable to me (you can see the personality forming) that I would just remove myself from the situation. (ex: your brother sits at the head of the table). My father was absent so my brother became "the man of the house". Oh, did that gall me. It may be why I give you so much trouble here :))