ummm......

...Beck?

You know how were talking about how snakes have hemipene, and about forked penises?

Well...

"(Besides opposable hind thumbs and tail) Male opossums have another unique appendage: a forked penis. Females have a two-channel vagina, so everything has to line correctly for successful mating. This means that the opossum can't crossbred with other species, which is another reason it has changed so little over the eons."

O_O

Fuck.