The only reason to get married in America today is if your biological urge to reproduce is so strong that you must, then do it right in a two parent family.
I liken marriage in America to the Salmon, who battle upstream, dodge predators, build a nest, and spawn - then reap the reward of rotting on the beach as bear / bird food!
I'm a Catholic. I believe there is more to marriage than sex and reproduction, though certainly those are a part of it. And yes, I do want children. I don't think there's anything wrong with that.
If that's all it is to you...and you believe there is little to no hope of marriages succeeding...I'm not sure how to continue this discussion.