In a visceral sense, being loved by an apex predator means being protected by one. Romantic storylines where a woman bonds with a wolf-man or a dragon emphasize that her lover is the most dangerous creature in the forest—and he treasures her above all else. This taps into deep-seated desires for safety in a dangerous world.

This is the most common and socially acceptable form. The entity is a human mind trapped in an animal body . Think of Disney’s Beast (a prince under a spell) or any number of werewolf romances where the male transforms during the full moon.