An erotic actor or erotic actress or a porn star is somebody who appears in pornographic movies. Many actors/actresses may appear nude in films (usually rather briefly) or on stage but even if they depict sexual behavior they are not considered erotic actors. Most erotic actors use stage names.
... the band made the stylistic switch from folk music to rock music, with Jerry Garcia, Ron Pigpen McKernan and Bob Weir[?] from the Jug Champions joined by Bill ...