Scissorpenis

There is a man who wants to have sex and any woman would do. His idea to get some is to become a married man, but ironically his wife was only into marriage and not the sex part. He becomes even more cross when she has an affair leading to his murdering her. He transforms into a creature who has three knives in the place of a penis. A club of nerds is climbing a mountain trying to meet this creature. They come face-to-face with the monster.