Yes, there is indeed a movie about
a man whose dick turns into a shark.
A romantic couple get more than they expected after the husband's experiments with penis-enlargement cream go awry. Wait, this is not a porn story. Rather, it is an absurd science-fiction movie that features a curious new species, the Dickshark. In some ways this story asks the same questions that Mary Shelly did when she wrote "Frankenstein."
This isn't one of my kinks, but I figured it could be of interest to some of you folks.
The trailer looks pretty dreadful.