There was a flick from the 90's on HBO or Showtime. I THOUGHT it was called "Pandora's Box", but I can never find it on IMDB. The story was that a man and his wife were remodeling a restaurant (I think) and a drifting woman came into their lives. She seduces the man and either he kills his wife, she kills his wife, or they kill her together. This is one of those soft core type flicks that kep me on the edge of my seat as a 12 year old boy... One detail I remember was that she was blonde - but not a natural one, and you saw the proof...

Pandora's Box (2002)
Pandora's Box -- Open-ended Trailer from Columbia Tristar... If you haven't seen this movie yet, you are missing out on a good and entertaining movie.. .
Pandora's Box (2002) (http://www.imdb.com/title/tt0285869/) - 87k

Hey, I don't have an answer... just wanted to know if you found it? As a kid myself back then I probably should not have been watching it ethier but I had a slack as babysitter who watched it constantly in front of me and insisted I stay in the room so she could keep an eye on me... now I'm older I'm curious to know how this movie really ended and all... thanks