Sex demons (female being called a succubus, and male being called an incubus), prey on humans via sexual intercourse, sucking like out of their partners. Because they are fully physical, they belong in the sub-category of cryptids. Sex demons tend to be very physically attractive as a measure to lure prey.
Sex demons, though they will attempt to conceal it, will always have a pair of horns and a forked tail. Always keep an eye out for these features.
Exorcising sex demons is not possible. But if they go long enough without a meal, they will die. The best way to ‘exorcise’ sex demons is to contain them until they starve to death.