Well, first and foremost, I would try to avoid having sex with a succubus at all cost. No matter what, you don't want to test your theory one way or the other, so staying away from a succubus would be the most logical solution.
If you do have sex with a succubus, it is not scientifically proven whether or not you go to hell. In my opinion, God would judge you based on your own life, not by whether you have terrible taste in women as evidenced by choosing a succubus for a girlfriend. That being said, many religions are very strongly against premarital sex, so that in itself could be enough to put you on the highway to hell.
However, don't fret! You are most likely safe considering that succubuses don't actually exist.
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