Rattlesnake mating sessions have been known to last more than 22 hours.
232
When a male honey bee climaxes during sex, his testicles explode and then he dies.
27
A banana slug can be 6-8 inches and their erect penis can be just as long. Also, their penises emerge from their heads. After sex, banana slugs eat each others penises.
17
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13