The sequel to Richard O'Brien's The Rocky Horror Picture Show is a musical called Shock Treatment which meets Brad and Janet some time after their adventure with Frank 'n' Furter.
Frank-N-Furter had been incestuously involved with his own mother, the "Old Queen" of the planet Transsexual (in the galaxy of Transylvania) she dies in the throes of seducing her own grandson. In the unproduced sequel Revenge of the Old Queen, it is implied that Dr.
In the musical The Rocky Horror Show and the film The Rocky Horror Picture Show (1975), Riff Raff ( Richard O'Brien) and Magenta ( Patricia Quinn) are revealed to be brother and sister who have a sexual relationship.The fourth story features a fictionalized Lucrezia Borgia having sex with her brother and father the short ends with the baptism of Lucrezia's baby, implied to be fathered by her own father. The first story features two cousins who have sex by the beach. Two of the shorts of the anthology film Immoral Tales (1973) deal with incest.
1.1 Incestuous families or several kinds of incest in one film or a film series.