Sorry guys, size DOES matter...

...at least when it comes to fertility:

When it comes to male fertility, it turns out that size does matter. But not the measurement that most men worry about.

The dimension in question is a measurement known as anogenital distance, or AGD.

The shorter the AGD, the more likely a man was to have a low sperm count, a U.S. study has shown.

Men whose AGD is shorter than the median length - around two inches - have seven times the chance of being sub-fertile as those with a longer AGD, according to the study published on Friday in the journal Environmental Health Perspectives.

That distance, measured from the anus to the underside of the scrotum, is linked to male fertility, including semen volume and sperm count, the study found.

I'll show you my AGD if you show me yours.