Bad Influence (1990)

Michael, a wimpy young executive, 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, while jogging, Michael runs into the stranger on a pier. He introduces himself as Alex, and the two go out to an under- ground club. Within a matter of days, Alex wheedles his way into Michael's life and turns it upside down, and Michael doesn't realize that Alex is a dangerous sociopath until it's too late.

Bad Influence is a thriller movie featuring Rob Lowe and directed by Curtis Hanson.

Bad Influence is currently streaming for free (ad-supported) on The Roku Channel and Tubi TV and it's also available on Amazon Prime Video.

It is also possible to buy Bad Influence on Vudu.