Bill Cosby testified under oath for about seven hours on Friday in response to a civil suit brought by a woman who accuses the veteran comedian of sexually abusing her when she was 15, a lawyer for the plaintiff said on Saturday. Friday's deposition related to the California civil suit brought by Judy Huth, who accuses the former star of "The Cosby Show" of forcing her to perform a sex act at the Playboy Mansion in Los Angeles in 1974 when she was aged 15. Lawyers for Cosby, who have previously called Huth's allegations "false and defamatory", could not immediately be reached for comment. 35 women who allege they were sexually assaulted by US comedy legend Bill Cosby were united Monday on a magazine cover to tell startlingly similar stories of abuse.