Dear Don,
I had no idea - - it turns out that human males are singular among mammals in not having a penis bone! In fact, for those who envy such things, you can even buy baculae on the internet:
Peter I was an oddity in many ways; perhaps he was a throwback of some kind or else, perhaps, an implant from a very large animal was the viagra of the day?
Bacula
Number one question at The Bone Room? What is a Bacula?! A bacula is essentially a penis bone found in many species of mammals. It is a large very dense bone uniquely shaped for each species and often used as an aid in classification of otherwise similar species. As could be expected, it is found only in males. The baculum is one of several heterotropic skeletal elements–ëi.e., bones dissociated from the rest of the body skeleton. It is found in all insectivores (e.g., shrews, hedgehogs), bats, rodents, and carnivores and in most primates except humans. Such wide distribution suggests that it appeared early in mammalian evolution.
Coyote Bacula $2.50 each
Fox Bacula $2.50 each
Mink Bacula $2.50 each
Otter Bacula $6.50 each
Raccoon Bacula $3.50 each
Seal (fossilized) Bacula $20-$35 each