Below are some true statements that go against the spirit of the present world
Adultery is not okay
I have to admit, I've thought about this rather critically myself. Why couldn't a man and a woman enjoy the pleasures of the flesh if they're not hurting anybody? Meaning outside marriage of course. Many do it and in fact even some married couples say they enjoy the idea of their spouse going off to enjoy a wild night with someone else (open relationship or swinging lifestyle), or even orgies with multiple partners.
The argument we could make is that the old reasons for protecting marriage are no longer valid. We have contraception so the problem of having both parents is not a problem anymore. Nor is there the problem of who is going to take care of the woman once she loses here "market value" and becomes pregnant etc. after all, marriage was basically an occupation for a woman, where the man would take care of here financial needs (food, clothing and marital rights, as the torah puts it).
I asked God about this one day and his answer was terse: the bond is unbreakable. In other words, adultery cannot be tolerated anymore than
You see, there is an invisible bond created between man and woman when they have sex (not when they stand on a red carpet by the way). Even more than this, there is a relationship on the earth between a man and a woman that reflects the eternal love between God and His creation.
I find that the best way to think of marriage is that it's an act of worship to God, where we give up time and effort to please God. This is not about you, your spouse or how good the sex life is. This is about faith! And faith means this: to be obedient to God when you don't