Here is the real suspect...

"...Slimes of Passion

Discovering the hidden nature of University of California SC's slippery mascot

The banana slug belongs to genus Ariolimax, a group of land slugs that range from the Salinas Valley north to Alaska and east to the Sierra Nevada. The species question is under debate. Some folks think that there is only one, A. columbianus, throughout the range; others claim the presence of a second, A. dolichyphallus. A definitive answer will be a long time coming.

Dolichyphallus translates as "giant penis", and the slugs we know and love definitely live up to it. Banana slug penises have evolved to be almost as long as their bodies. When you consider that the average banana slug is 6 - 8 inches long, this endowment is impressive even by our standards. While having a big member to show off before mating may be a plus when trying to get the attention of that special slimer, there are drawbacks.

Since slugs are hermaphrodites, each partner's wiener must fit into the other's genital opening. This makes choosing a mate of equal size a must. Before actually getting down to it, both partners check out each other's equipment - no slug can ever be accused of rape, because both partners must present their plumbing before anything else happens. If either slug miscalculates, it may get its wanker stuck during actual copulation and be unable to pull out afterward. When this happens, the unstuck partner bites off the stuck one's slughood - scientists call this "apophallation", though "Bobbitization" may have more of a ring in popular circles."