An incubus is a demon
who takes on the form of a human male to have sex with a human
female. Incubi, being mythological creatures, don't have
testicles and don't make sperm, but they do collect human sperm
from succubi and deposit it in human
females for some diabolical reason.
and sleep paralysis.
books and articles
Carus, Paul. The History of the Devil and the Idea of Evil
(Gramercy, 1996) reproduction of the original 1900 edition.
de Givry, Grillot. Witchcraft, Magic & Alchemy, trans. J.
Locke (New York: Dover Publications Inc., 1971), an unabridged
republication of the Houghton Mifflin edition of 1931.
Hicks, Robert D. In Pursuit of Satan : the Police and the
Occult (Buffalo, N.Y.: Prometheus Books, 1991).
Hill, Frances. A Delusion of Satan - The Full Story of the
Salem Witch Trials (New York: Doubleday, 1995).
Sagan, Carl. The Demon-Haunted World - Science as a Candle in
the Dark, ch. 7 "The Demon-Haunted World," (New York: Random
Smith, Homer W. Man and His Gods, ch. vi "The Rise and
Fall of His Satanic Majesty's Empire" (Boston: Little, Brown and