When I first saw your comment I was all set to correct you, because the inside of a penis has lots more parts: 3 different nerve pathways, specialized blood vessels, two different types of erectile tissue, smooth muscle, venous drainage, urethral epithelium, skeletal muscles at its base...

It would be pretty low. Did you notice the part about the sledgehammer? I’m not exaggerating.

Whats the iFixit rating on it?