What I learned today

A friend, while reading a book on the environment for a class, came across the use of the word "pizzle" as regards the use of said "pizzle" by a opossum during "coition." A quick search on the etymology of "pizzle":

pizzle
"penis of a bull used as a flogging instrument," 1523, from L.Ger. pesel or Flem. pezel, dim. of root of Du. pees "sinew," from O.L.G. root *pisa.
(courtesy of Online Etymology Dictionary)

And yes, "coition" means exactly what you think it means.