Os relates to the bone.
It is my understanding that all mammals have an os penis except man. It is the reason that dogs get hung up after mating. The length of bone does not relax when they get turned around.
The reason I asked is that I have known trappers to take the particular bones and make tooth pics, neckleaces, and trinkets for hat pins.
I saw a guy wearing one on a bead string recently and I thought it was funny knowing what it was, and most people don't.
This has no signifcicance other than a curiosity.
http://en.wikipedia.org/wiki/Os_penis
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