Virginia Roberts alleged that Dershowitz sexually assaulted her on Epstein's planes.
Guardian 2015 story on allegations quotes:
Roberts, who claims she was made a sex slave by Epstein, and that he loaned her to rich and powerful men, alleges she was required “to have sexual relations with Dershowitz” on numerous occasions while she was a minor in Florida, New York, New Mexico and the US Virgin Islands, as well as on the hedge fund manager’s private planes.
Roberts’s attorney’s court filing, submitted on 30 December, also alleges: “Dershowitz was an eyewitness to the sexual abuse of many other minors by Epstein and several of Epstein’s co-conspirators.”
https:// www.theguardian.com/us-news/2015/jan/06/alan-dershowitz-underage-sex-accusations