To give you an idea how bad this is, the female lead is portrayed by two different actresses (Jennifer Warren and Sybil Danning), and I constantly kept wondering why the film maker might have done that (now I know). I'd swear that Sam's girlfriend, later Andrew's wife Carol was also played by two different actresses, but the credits don't go there. To save you the trouble of going there yourself, De Niro's character is a maker of porn flicks, and an aspiring politician running for governor can't afford to have one of his productions see the light of day. I don't know about you, but I had the gov picked as the guy behind Sam's murder as soon as his personal assistant appeared on screen. The horny women were just a distraction to keep you guessing. Come to think of it, so was the title, because any swap that conceivably occurs in the picture turns out to be rather innocuous.
Even though De Niro's name heads the cast credits, the actual lead role for this one is handled by Anthony Charnota as Sam's brother Vito on the trail of his killer. By the time it's over, Vito leaves a trail of dead bodies behind him, even though he was being closely tailed by a detective named Benson; the cop never figured in the story's resolution. I had to laugh when the picture borrowed one of those gimmicks from 1940's Westens with an unknown person shooting the older Erica through a window and Vito giving chase. Who shot Vito? I don't know. Neither will you.