Oh man, this is a twisted movie.
Yuppie lawyer Ted (adult film actor Randy Spears, credited here as Gregory Patrick) is shocked when he sees a painting of a man who looks just like him. He is told that the portrait was painted in 1964 and that the man in the painting is the late husband of the artist, Arlene (porn legend Georgina Spelvin, credited here at Ruth Raymond). Arlene goes on to reveal that Ted is actually her long-lost son and then she invites him and his wife, Evie (Linda Blair, credited here as Linda Blair), to come out to her mansion. What Ted doesn’t realize is that Arlene believes that he is actually her husband reincarnated and she is planning on doing away with Evie so that she can have her son all to herself and do what it is she wants to do with him. Yes, this film goes there.
Chuck Vincent was one of the leading directors of the Golden Age of Porn. Unlike most other adult film directors, his movies were popular with not only the public but also with critics. (His best-known film, Roommates, received a rave in the New York Times.) In the 80s, Vincent tried to make the move into mainstream film, mostly directing sex comedies and dopey thrillers. Most of his mainstream films featured adult performers in dramatic roles, which made them very popular on late night cable.
Bad Blood feels like a combination of Fatal Attraction and Misery. There’s even a scene where Arlene ties up her son in bed and then breaks his toes to keep him from leaving. (Bad Blood, though, came out a year before Rob Reiner’s film so the resemblance is probably a coincidence.) Spelvin, who was widely regarded as being the best actress to ever regularly appear in pornographic movies, gives a great, demented performance as Arlene and Linda Blair is also good as Evie. Chuck Vincent was a good director, even when he was doing schlocky straight-to-video stuff like this. Perhaps because of his background in adult films, Vincent never hesitated about taking his films to the places where other directors would be scared to tread. Sadly, Vincent died in 1991 and most of his movies have fallen into obscurity.
Though it is sometimes hard to remember, there more on late night Cinemax than just Shannon Tweed films like 
Through the Shattered Lens 