]Every relationship is different. Some people believe that you can share your life with that special someone, and still be allowed to have sex with others. For example, Vincent Cassel and Monica Belluci were married for 14 years and had 2 kids. They had an open marriage and It did worked for them for a while. I am not saying that Michael is like that. I don't know him.
Yes. Every relationship is different. It does seem that the Cassels had an open relationship to which both parties were happy. However, MIke wants eventually to have what his parents have ( a monogamous relationships that's 40 years strong). However, since he travels away a lot for work he might succumb to sex with random women/actresses whilst being in a monogamous relationship.