Science had shown that those who are the smallest when not aroused, will be the largest when aroused. This is due to the tone of the muscles and blood vessels etc that surround the area...

A little humor here... a joke I heard long ago...

Guys in a locker room shower.... most all were athletes, well endowed, when a nerd comes in to shower and shows but a very small attribute. The guys all laugh, and one of them shouts," Who you gonna satisfy with that? "To which the nerd replies, "Me." So you see, all things are subjective.