"(Downing) puts his genitals in a person's face, whether it's a man or a woman, I think there should be some punishment for that," said District Attorney Leon Cannizzaro, according to CBS affiliate WWL-TV in New Orleans.
State District Judge Karen Herman set sentencing for Nov. 29.
A video that went viral on the Internet appeared to show someone in a University of Alabama jacket performing a simulated sex act on an unconscious man at the restaurant after the Crimson Tide beat LSU for the BCS football championship on Jan. 9.
The LSU fan, whose name has not been released, has sued Downing, asking damages for "mental anguish, humiliation, embarrassment, anxiety and depression ... damage to reputation" and lost tuition payments "for having to withdraw from school." Under state law, lawsuits cannot include a suggested dollar amount for damages for pain and suffering.