Flatworms

A flatworm species known as "twenty-four penises," which can function as male or female, will insert its 24 members or "stylets" into anything soft and warm. Basically, they keep humping anything and everything until they either impregnate or become impregnated. I mean, with a name like "twenty-four penises," I would expect nothing less. [Hu Berlin] Related: The 10 Most Horrifying Animal Penises On Earth