People have come up with different explanations for the incubus legends. In the Middle Ages, people worried a lot about sin, especially sexual sins of women. Victims may have been experiencing waking dreams or sleep paralysis. Also, nocturnal arousal, orgasm or nocturnal emission could be explained by the idea of creatures causing an otherwise guilt-producing and self-conscious behavior. The influence of incubi could also have been used to explain how pregnancies happen outside marriage; such pregnancies were often "unexplainable".and unnoticed 