Das Monster und die Schöne (1992)

Dr. Jenkins, a scientist, finds his wife Helen in the hands of another man, Watkins. This drives him mad and he spends endless days and nights in his laboratory with his experiments. With just the right potion and anger, he is transformed into an angry beast that is lecherous at night and indulges in the company of horny women. Only the love of his wife could lock the beast away forever... or so he thought.