Incubus and Succubus

Incubus (male) and Succubus (female) are mythological demons that said to be taking up a human form to seduce real human for sexual intercourse. They are very attractive although they were evil beings that hunt human simply for pleasure.

Incubus are outnumber compared to Succubus and both of them drain souls by having sex and give birth to a semi-human offspring, called Cambion.

Perhaps, these creatures are just another excuse for prostitution in the olden day whereby people can be easily fooled and superstitious against those that they do not understand. Possibly for those who want to escape damnation, they created these creatures.