Xoophilia
Xoophilia is a paraphilia in which a person experiences a sexual fixation on non-eathling species. This includes sexual activities with alien species and interbreeding. Note: It doesn't include interspecies mating with animals, as they're from earth.
Caos Gods currupt millions of people in Imperium of Man to engage in xoophilia with Caos demons and various species in galaxy.