The Sea Worm

A suspected sea creature of the 13th century, reported to not attack it's victims, but to induce swelling if touched.
=== Popular Unbelief ===
Truely one of the most revolting creatures it draws 
similarities to that of a penis due to shape and size. The analogy continues in that touching the Dick-Fish causes your hand to swell as if infected by crabs.
It's also suspected this was a Christian attempt to frighten people away from beating the one-eyed-willy, thus making such an act dangerous.
=== Associated Mythology ===
It's widely believed that most sailors would avoid masturbation, not due to fear of this beast but more due to the expectation that somewhere in the depths of the ever moist ocean a Vagina-Fish waited to be discovered.
=== Reports and Sightings ===
In 2006 a swimmer encountered this creature, see newapaper clipping below.
=== References ===
[The Unbelievable Podcast] Episode 196: Sea Monsters Part 1 - The [...]
http://podplayer.net/#/?id=31312798 via @PodcastAddict