This is, in a way, another "succubus" story like the VERY depressing yet powerful "Out of focus" from the CBS RMT first season.  A succubus was a type of demonic spirit which would sleep with men; Wikipedia says that "Religious traditions hold that repeated sexual activity with a succubus may result in the deterioration of health or even death." (It doesn't say WHICH traditions, but one doesn't want to embrace the demonic, no pun intended, anywhere in his life.)  This story is more subtle than "Out of focus" was, with a smaller but very talented cast of Earl Hammond (who was also in "Out of focus"), Mandel Kramer and Terri Keane.  Interesting.