A couple find another couple who are very attractive and sex and then they exchange partners. Once, twice they have sex in their expensive houses and then at the end the other couple set them up and kill someone and try to make it look like as if the others killed them. That is it I remember. It is quite an old movie (10years or so). Thanks

Sounds like Consenting Adults (http://www.imdb.com/title/tt0104006/)

Man living in canada with women ( true story ) he was using these women in like a commune. Very mean stabbing one girl in the hand right onto the table.

Man living in canada with women ( true story ) he was using these women in like a commune. Very mean stabbing one girl in the hand right onto the table. He had a beard and was very controlling. Lived out in the woods.

No I don't think it is Consenting adults :(