Bio Illogical

Yesterday in the parking lot the man in the truck in front of me was creeping pathetically out into the intersection like the decrepid octagenarian it turned out he actually was. I yelled at him (not that he could hear me) "Drive like you've got a pair!" I admit to a certain degree of belligerence when I'm driving, but I do my screaming with the windows up, so it's really all just for my own benefit.

However, this got me thinking: Why is the possession of testicles associated with boldness and risk-taking? If anything, being the owner of a matched (hopefully) set of testicles should incline one to be more cautious, timidly guarding said testicles. They are in need of protection, in case you hadn't noticed.

Speaking of which, if evolutionary theory is correct, why don't my testicles have an armored carapace? Huh? Answer that, Darwin! Where's my testicular carapace?