Rachel appeared in over 100 adult videos between 1985 and 1992. She had many pseudonyms, including Penny Morgan and Penny Moore.

After starting out in adult entertainment under the names Serena, Ingrid Elliot, and Penny Morgan, she eventually had plastic surgery on both her face and breasts and adopted the name Rachel Ryan. By 1991, she underwent breast reduction surgery due to health concerns.

She is regarded as one of porn's first "anal queens". Many of her scenes involved anal sex, and due to her willingness and skill in this, she earned the nickname "Rubber-rectum Ryan" (among others) within the adult film community.

She reportedly had a rivalry with porn actress Patti Petite, and during the production of Rambone: The Destroyer the two co-starred in the opening and closing scenes. Instead of fighting, these actresses took out their aggressions on each other's genitals in scenes that involved rimming, breast biting and anal penetration with a large dildo.

In 1988, Ryan had a small role in Clean and Sober, starring Michael Keaton; she and Keaton had a widely-reported affair in the early 90s. On April 27, 1992, she married the late comic actor Richard Mulligan, but this union only lasted two years.

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