Eternal beauty and youth, who doesn't dream of that? For Julian, this dream becomes reality. But in contrast to his appearance, his image in an oil painting ages in a frightening way. On top of that, Julian is developing into a real monster.

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.

Anyone who falls under the spell of the Sexmaster loses all inhibitions. Through metamorphosis, he enters any body and spreads lustful desire, sensuality, and lust.