Succubus
a female demon who appears to be a very beautiful woman and has sex with men to feed off there sexual energy, may also collect the victim's sperm which is then used by an Incubus (male sex demon) on a human female to create a Cambion, deformed or supernaturally-receptive children.

some say that a Succubus "eats" a man's soul during sex, and repeated visitings have been said to cause death.