Exception to the Rule

 Exception To The Rule is a 1997 Canadian erotic thriller film directed by David Winning and stars Kim Cattrall, Eric McCormack, Sean Young and William Devane.
Plot summary.
A married jewel trader is seduced by a beautiful woman while on a business trip. Upon returning home, he receives a video tape in the mail of his tryst and a threat to ruin his marriage if he doesn't turn a shipment of diamonds over to the woman.
Release.
It premiered in Japan on April 5, 1997 and in the US as part of the 1997 Houston Film Festival The feature was released on VHS by Artisan Entertainment on June 15, 1999.
Reception.
Joe Leydon, of "Variety", said there's a certain novelty to seeing Young cast against type and Cattrall is good for a few laughs as she throws herself into her devious character with lip-smacking, dirty-mouthed relish.