Mom seduces a rich old lug into marriage.
Immediately after the knot is tied, Daughter lures him into bed. This allows Mom to stumble in on them and emerge with a generous settlement. Heartbreakers isn't exactly about broken hearts, but you get the picture. Ray Liotta enters the film as one of their first victims. It's an oddly sentimental moment for a relatively moral-free film, and it simply doesn't make sense.