All you are going to do is increase your emotional intimacy which will influence your sexual desires, all while your commitment is too low for such feelings. I’m not saying you can never talk about having kids.
But if you are in the “not that serious” zone and you are talking about how the two of you are going to divide up the holidays with your families once you get married 10 years from now, you are playing with fire.
Therefore you should put boundaries around your expectations and hopes in your Christian dating relationship. I’m not saying you need to be hopeless or never have expectations. If you are closed off and don’t have hope, you are dooming the whole experience from the start. Sexual boundaries are what most people think of first because it’s probably the easiest temptation to fall into. Guard what you say if you want to guard your heart. Not everyone feels the same way about these three words as I do.
But I believe these words should not be spoken in a dating relationship.
You want to open up enough for the person to really get to know you.
You want to get the most out of the dating experience to see whether marriage is in the cards (which I believe is the healthiest goal of dating).