Billy Joe Saunders has been fined £100,000 and given a severe reprimand about his future conduct after video footage emerged of him appearing to offer a woman drugs.
Saunders' actions - filmed from his car and seemingly showing him offering £150 worth of drugs to the woman to perform a sex act before asking her to punch a passer-by, which she does - generated widespread condemnation.
The WBO middleweight champion was last week hit with a misconduct charge by the British Boxing Board of Control, which found Saunders guilty of bringing the sport into disrepute at a hearing on Tuesday.
A statement on the BBBoC website said: "Billy Joe Saunders appeared before the stewards of the British Boxing Board of Control today under a misconduct charge following his recent behaviour shown on social media.
"The stewards have found Mr Saunders guilty of bringing the sport of boxing into disrepute and have fined him the sum of £100,000 and issued a severe reprimand as to his future conduct.
"All monies will go to the BBBofC charity to assist ex-boxers and ex-licence holders who have fallen on hard times."