All I remember about the plot was that it starred two couples that were getting divorced due to the wife from one couple cheating with the husband from the other. The "victims" (the now ex-husband and the mother and daughter) end up getting together and starting a serious relationship. They end up having a threesome (Man with mother and daughter) and video tape it to send to the "cheaters" from their old relationships.
I apologize now for any mistakes or confusion, but i am working off of pure memory here.
Please and THANK YOU!!!