Just ask any gay man looking for a hook-up on Grindr. Retrieved 13 November The difference between the two estimates: The vaginal canal is believed to have expanded in humans to accommodate the larger size of a newborn's skull. In Stang J, Story M ed. A new study conducted out of Utrecht University in Amsterdam shows a link between gay male penis size and gay self-esteem.
Sometimes guys with relatively small flaccid penises grow to a larger size when erect, while their larger counterparts don't show as much growth when aroused.
One study tried to figure out which English-speaking country lied most often about their penis size. Can Urol Assoc J. Psychology Press. You can't judge the true size of a penis while it is flaccid.
Age is not believed to negatively correlate with penis size.