Parker was reportedly introduced to the adult film industry during the late 1970s by actor John Leslie, who suggested she take part in one of his upcoming films. Upon hearing that it was a pornographic movie, Parker reportedly declined the offer. Eventually she eased into the industry by playing bit parts in non-sexual roles.
However, porn director Anthony Spinelli talked her into doing her first sex scene in Sex World (1977).
Kay Parker also continued her "mature woman with a younger man" motif in some softcore films, such as Desert Winds (1995). She also played herself in the 2005 independent film Dick Ho: Asian Male Porn Star – a mockumentary about a fictional legendary Asian porn actor which included some interviews with known adult film actresses from the 1970s in which they discuss their "memories" of the star.
In 2001, she wrote a book titled Taboo: Sacred, Don"t Touch (), in which she wrote about her early childhood, her career in the adult industry, and her experiences with the metaphysical.