Well, there are definitely some people who would take your last analogy and say we should feel very,very,very badly about eating meat, and that we should all stop doing it immediately.

The marriage vow is different in America (and most of western culture) than it is elsewhere. In America, we vow to remain faithful to that person in front our families and friends. Of course, you don't have to take that vow, but I reckon most people do.

That's not to say that you're wrong in how you feel about it, it's really down to a matter of opinion. I don't see the point in getting married if I'm going to have extra-marital affairs. I don't even see the point in dating exclusively if I'm going to be seeing other people. I don't have the time, inclination, or mental capacity to be in romantic relationships with multiple people. I want to find one person I care about and develop a relationship with them. If you don't want that, that's okay. You just can't marry me!

EDIT: Miriel, in a lot of tribal cultures, monogamy isn't really a big deal. Both men and women tend to have several sexual partners, and the entire community helps raise the offspring.

But we don't living on communities like that. Because we are a society that is very private, the nuclear family is what works best for us. That's why I only want to be with one person. But likesay, if someone doesn't want that, then you just have to find the right people to be with, I reckon.