Xenophilia

A romance or erotica plot centered on a human character's romantic or sexual attraction to an alien, monster, or other non-human entity, with the relationship exploring the emotional and physical differences between species.

Readers are drawn to the thrill of the unknown and the taboo, finding catharsis in a love that defies all earthly norms and often features a partner who is intensely devoted yet utterly foreign, offering an escape from human complications.