Attorney Alan Dershowitz boasted of his "perfect sex life" in an attack on lawyer David Boies during an appearance on Fox News' The Ingraham Angle on Thursday night.

Dershowitz helped secure financier Jeffrey Epstein his plea deal back in 2007 over sex trafficking charges.

David Boies is representing an accuser of Epstein, who alleged that Dershowitz also abused her. Dershowitz denies the allegations.

David Boies has filed a defamation lawsuit against Dershowitz on behalf of his client, Virginia Giuffre.

Visit Business Insider's homepage for more stories.

Attorney Alan Dershowitz boasted of his "perfect sex life" in an attack on David Boies, a lawyer representing one of financier Jeffrey Epstein's accusers.

Dershowitz appeared on Fox News Thursday evening to defend himself against allegations that he abused Virginia Giuffre (formely Virginia Roberts) as part of Epstein's alleged sex trafficking operation.

Dershowitz strenuously denies the allegation.

During his appearance on Fox News, Dershowitz attacked David Boies, Giuffre's lawyer, at which point he started to discuss his sex life.

"I have had sex with one woman since the day I met Jeffrey Epstein. I challenge David Boies to say under oath that he's only had sex with one woman during that same period of time," Dershowitz said Thursday in an interview on Fox News' "The Ingraham Angle."

"He has an abnormal amount of chutzpah to attack me and challenge my perfect, perfect sex life during the relevant period of time," said Dershowitz, adding: "He's doing it for money."

Watch the latest video at foxnews.com

Dershowitz was on the team of lawyers who secured Epstein a plea deal back in 2008. The plea deal saw federal charges dropped and Epstein serve 13 months in jail on charges of soliciting a prostitute and soliciting a minor for prostitution.

Epstein was arrested in July on new federal charges of sex trafficking minors and conspiracy, to which he has pleaded not guilty. In the indictment, prosecutors alleged that Epstein molested girls as young as 14 in a sex trafficking operation that ran from at least 2002 to 2005.

In April, Boies sued Dershowitz for defamation on behalf of Giuffre who claims that he made "false and malicious" statements about her, by calling her a liar.

"I will prove without any doubt that she is lying about me," Dershowitz told CNN in response to the suit. "She is going to end up in prison."

"Not only am I saying it didn't happen – I have categorical evidence that we never met," Dershowitz told NPR.

Dershowitz has filed bar complaints about Boies in Florida, New York, and Washington, reports the Wall Street Journal. All of the complaints have been dismissed, the Journal reports.