According to medieval European legends (although it has equivalents all over the world) it is an evil entity like a demon, usually shaped like a human male that seduces (when it does not violate) women in a position to procreate. The purpose would be to get a son to inherit some of his characteristics. Several myths ensure that the incubus was before a succubus, since the demons have no semen and must first extract it from a man with deception and then inseminate a woman; that's why she can recognize the demon by feeling her cum cold. The etymology is Latin, incubus is formed by the prefix in- ( "in , inside , in this case can be understood as over or above" ) cubare ( "lying" ) .
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