Bad Influence (1990)
Wimpy young executive Michael is about to get pulverized by a jealous boyfriend in a bar when a handsome, mysterious stranger steps in—and then disappears. Later that night, Michael runs into a stranger on a pier, who wheedles his way into Michael's life and turns it upside down. jealousy, underground, eroticism, sociopath, drugs, stranger, club, executive, neo-noir