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In Western medieval legend, an incubus (plural incubi) is a demon in male form supposed to lie upon sleepers, especially women, in order to have sexual intercourse with them. It is believed that this was done in order to spawn other incubi. The incubus drains energy from the woman on whom it performs sexual intercourse in order to sustain itself,[citation needed] and some sources indicate that it may be identified by its unnaturally cold p***s.[1] Religious tradition holds that repeated intercourse with such a spirit by either males or females (the female version of the incubus is called a succubus) may result in the deterioration of health, or even death.[2]

Incubi and succubi were said by some not to be different sexes but the same demons able to change their sex.[9] A succubus would be able to sleep with a man and collect his sperm, and then transform into an incubus and use that seed on women. Their offspring were thought to be supernatural in many cases, even if the actual genetic material originally came from humans.[4]

Though many tales claim that the incubus is bisexual,[10] others indicate that it is strictly heterosexual and finds attacking a male victim either unpleasant or detrimental.[11] There are also numerous stories involving the attempted exorcism of incubi or succubi who have taken refuge in, respectively, the bodies of men or women.

Incubi were sometimes said to be able to conceive children. The half-human offspring of such a union is a Cambion. The most famous legend of such a case includes that of Merlin, the famous wizard from Arthurian legend.[5]

On the other hand, the Franciscan friar Ludovico Maria Sinistrari stated that incubi "do not obey exorcists, have no dread of exorcisms, show no reverence for holy things, at the approach of which they are not in the least overawed."[5]