Shane and Sia posed together in two top-selling issues of Playboy, and also in several internationally-distributed calendars. Not long after their Playboy days, they made a foray into voice acting, with several cameo appearances as brunette scientists in the American animated series Eek! The Cat.

Shane and Sia began modelling at the age of seven when they posed for a layout in the Sears mail-order catalog. Their adult career has spanned fashion, softcore, and pin-up modelling. After the success of their 1993 calendar released by Topps, Shane and Sia published a premium-rate telephone number called the Barbi Hotline. In addition to the calendar, Topps also published two comic books and a promotional trading card depicting Shane and Sia.

As adults, the twins developed bulimia, which they have since overcome. Their book, Dying To Be Healthy: A Breakthrough Diet, Nutrition and Self Help Guide (1999), tells the story of their struggles with eating disorders. A portion of the book's profits benefit organizations that strive to combat eating disorders. In the 2000s, Shane and Sia lectured and spoke on television, radio, and online about eating disorders and their careers. In early 2001, they appeared on the CBS television program 48 Hours in a piece about eating disorders, entitled "Slim Chance". After the program aired, CBS hosted a moderated online chat session in which the twins responded to questions from the public.

Shane Barbi has been married to actor Ken Wahl since September 17, 1997. She is Wahl's third wife; his children from past marriages include Louie, Raymond, Cody, and Kyra. In an interview on the Howard Stern Show on the E! Network and as reported in the January 2004 Hustler magazine article, Shane Barbi claims that she "shares" Wahl with Sia. The Hustler article went into further detail claiming that the twins have engaged in incestuous lesbian acts performed for Wahl.

In 2003 the twins sued Larry Flynt over explicit photos taken by Wahl earlier in the year and described in the lawsuit as showing "intimate sexual acts between the twin sisters,". [1] The photographs appear to be the ones later published in the January 2004 Hustler article.

 Magazine appearances

• Celebrity Sleuth #35 2004.
• The National Enquirer May 31, 2004.

Nude

• Playboy September 1991.
• Playboy January 1993.
• Playboy (Deutsche Ausgabe) January 1993.
• Playboy (Deutsche Ausgabe) October 1995.
• Hustler January 2004.

Calendars

• Barbi Twins: Shane and Sia – 1993 Calendar. 1992.
• The Barbi Twins 1995 Swimsuit Comic Art Calendar. Topps Comics, 1994.
  • Artists include John Byrne, Adam Hughes, Julie Bell, Miran Kim, Linser, et al.
• Best of the Barbi Twins 1997 Calendar. H & H Global Inc.
• Barbi Twins 2000 Health & Fitness Calendar. Pentimento Entertainment, 1999