It's a fetish about eating, usually about eating the subject of your desires. I can understand how such things can be mixed together. Eating and consumption are not so different from desire and obsession. After all eating ones enemies and loved ones to make them part of you is not uncommon in various cultures around the world. Though generally not something practiced in the modern era.

Though I know nothing about psychology so there may be no link at all and some people just have really bad taste in their fantasies.