Billy Joe Saunders has been fined £100,000 and warned about his future conduct by the British Boxing Board of Control (BBBofC) following the emergence of a video that police described as "sickening".
Saunders was called before the misconduct hearing after a video circulated showing the WBO middleweight champion in a car appearing to offer a woman drugs in return for performing a sex act on another passenger in the vehicle and assaulting a passer-by.
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The woman is seen striking a man in the footage before Saunders drives away. No drugs can be seen in the video.
Saunders apologised on Twitter but his actions have led to a hefty fine from the BBBofC, and the incident remains under a police investigation.
"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," read a statement.
The unbeaten Saunders is scheduled to defend his title against Demetrius Andrade in Boston next month.