Los Angeles, May 17 (IANS): Playboy boss Hugh Hefner is being sued over claims he "conspired" with actor-comedian Bill Cosby to drug and sexually assault a teenager at the Playboy Mansion here.

The 90-year-old is named in legal papers filed on Monday by a dancer here who has alleged that Cosby attacked her at a party in 2008 at the mansion, when she was just 18, reports dailymail.co.uk.

The dancer named Chloe Goins claims Cosby gave her a drink and that she later woke up to find herself naked with Cosby biting her toes and with his pants around his ankles.

She also alleged in papers filed at the Los Angeles Superior Court that it was Hefner who told her to lie down because she felt ill after Cosby gave her the drink. 

Her attorney Spencer Kuvin said that Hefner needed to be held to account for what he said was 30 years of Cosby's sexual conduct.

"We believe that Hefner not only knew but at the very least should have known what Cosby has been doing to these women over the last 30 plus years," Kuvin said.

"Thus far no one has been held to account for tacitly standing by knowing what this man was doing," he added. 

The case is the first to sue Hefner. It comes after a separate case sought to have him deposed over another allegation of sexual assault by Cosby at the Playboy Mansion in 1974.

Goins's allegations against Hefner are a fresh twist in her long-running claim that she was assaulted by Cosby.

The allegations have been investigated by Los Angeles police and a file sent to federal prosecutors, but no action has been taken against him yet.