Would you invite a murderer or rapist into your home? If the answer is no, then I would suggest you contemplate why you would want to summon a demon or incubus (basically a spiritual male rapist). If you have no knowledge as to how to, then I doubt you have done enough research in the occult and magick to be capable of handling yourself IF you succeed.
Demon (origin of word) "of evil", a fairly modern variation of "djinn". Throughout the history of spirituality, there have always been darker forces revered. The dark side of nature is a powerful force, but can be a very dangerous one when placed in inexperienced or greed driven hands.