Is this the movie I'm thinking of?
I think I saw this on video in 1992. I couldn't remember the title, so I asked about it on an IMDB board, and somebody suggested it might be "Illicit Behavior." I remember the female lead character telling her husband that she was molested by her brother as a kid. The husband then beat the brother to death. It turned out that she lied about being molested to trick her husband into killing her brother so that she could receive an inheritance from her parents. The female lead was a very seductive woman. Is this the right movie?
If this is the movie I'm thinking of, I wish they would release this on DVD.