Wikipedia
Exophilia
Exophilia is the love of strange, new, extraterrestrial, robotic, supernatural, or otherwise non-human life-forms. It can be considered as a sexual form of neophilia. People with exophilia have a desire to be with non-human life forms, but that are essentially human in an alien form.
It also is linked to the belief of otherworldly entities, energies, and/or beings. Mythos from other cultures tell of spirit/alien/demigod/etc. couplings with humans that are sexual in nature, which gives hint that perhaps at one time exophilia was possibly more common.