I never knew this

One could logicly hypothesize that. However, an investigational study is warranted.
I would further hypothesize that in humans, it may not turn out to be testicles, but correlate to another characteristic.

Why did I think immediately of Lord Dampnut?

That doesn't look right. I should specify this isn't "hands on" research. The mud crickets have told me.
Yeah. That sounds better. Mud crickets.