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After graduating, Sable entered the pornographic film industry in 2004 after moving to Los Angeles. Sable signed with Exotic Star Models, and continued to be represented by them after signing with Wicked Pictures, albeit for only print work. Her first adult film was First Offense 5 with Peter North. In April 2005, Sable signed an exclusive contract with Wicked Pictures. President and owner Steve Orenstein observed that "Keri is destined to be the next big thing - we're very happy to have signed her."
According to an AVN interview, she had planned to get breast implants in November 2005 as part of an attempt to shift her image from lolita roles in gonzo films to big budget contract work with Wicked.