If you've ever wondered what a mindfuck looks like, now you knowAnnalee Newitz11/12/13 8:00pmFiled to: animal behaviorzoologymarine biologybiologysea slugsscience488EditPromoteShare to KinjaToggle Conversation toolsGo to permalink Meet Siphopteron species 1. It's a species of sea slug, recently discovered by Rolanda Lange. To procreate, two members of the species get together, stick organs into each other's heads, and fertilize. That's right — nature has at last provided us with a perfect example of the mindfuck.I think "skullfucking" might be another word that could be used here, if only these weren't invertebrates. Still, they are hardly the only creatures with odd mating habits.