Vipers (1998)

When a handsome karate pro went looking for a change, he found something more sexy, risky and exciting than anything he'd ever imagined. Hired as a caretaker for a wealthy couple, he's seduced by the neglected wife and offered an opportunity to share her millions, if he's willing to go all the way. Wild, dangerous and out of control. Even the strongest fall victim to the powerful allure of Dark Passion.