Jason, you're quick to cite research but slow to explain it. If your goal is sex, by all means move in. If your goal is healthy, happy children in a stable marriage, don't have premarital sex. The research you cite on cohabitation mentions the increase in divorce if children are involved. Thinking cohabitation doesn't matter is thinking too short-sighted. It's thinking selfishly. If one argument will stick out to you in my jumble of words, it's that the children matter. They matter more than you and me. I'm using the example of a healthy, committed marriage as the best way to raise good children. If you can't see that by looking around in the "real world" or in your own life, then no matter of research will convince you either.