The alleged victim, Michael Egan III, said in a lawsuit that Singer forced him to have sex at parties in California and Hawaii in the late 1990s, when he was 17 years old.
But Singer's lawyer said the allegations were absurd, and that the timing of their release was designed to generate maximum publicity ahead of the release of the latest "X-Men" movie next month.
"It is obvious that this case was filed in an attempt to get publicity at the time when Bryan's new movie is about to open in a few weeks," said Marty Singer, who said he is not related to the director.
The abuse "resulted in Plaintiff suffering catastrophic psychological and emotional injuries," added the legal document, a copy of which was obtained by AFP.
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The 13-page lawsuit, filed yesterday in Hawaii, claimed that Singer promised Egan acting roles in an "X-Men" movie, commercials and other projects.
Singer allegedly plied Egan with drugs and sexually assaulted him in and near a swimming pool in Hawaii, in one of the alleged attacks listed in the legal document.
Egan and Herman were due to hold a press conference in Beverly Hills today to give more details about the allegations.