Anogenital distance (AGD) is the distance from the anus to the genitalia, the base of the penis or vagina. It is considered medically significant for a number of reasons.
For example, recent research discovered that men with longer anogenital distance tend to have better fertility and reproduction potential.
AGD is twice as great in males as in females, so it serves as a marker of proper male development.
Guys, go get your rulers. There is something you forgot to measure.