This morning, I found a card in my files that I wrote 13 years ago: “We are biologically programmed to reproduce. Like every childbearing creature on earth, our whole beings are set up to make babies, to continue the species in an unending chain. If we don’t, we wander, lost, trying to find our way home. It’s as basic as eating, sleeping and excreting.” Ironically, I woke up thinking the same thing this morning as I wondered what to write this week. Maybe it was seeing the pregnant women on TV’s “Bachelor in Paradise” last night.

Before you get mad, think about it. We have all these parts designed to make, carry, deliver, and feed our offspring. Why would we choose not to use them? Why would some people go so far as to surgically disable the baby-making parts? What other animal does that? It seems unnatural. What do you think? I really want to know.

Last week’s post about my friend’s daughter’s fiancé suddenly announcing that he doesn’t want kids sparked a barrage of comments both at the blog and at the Childless by Marriage Facebook page. Some were sympathetic, some quite angry. How dare I suggest that that guy or anybody has to want children? He has a right to change his mind. He might have good reasons for feeling the way he does. I know. It’s all true. And it still sucks. In every situation like this, somebody is going to wind up brokenhearted.

Consider this: For most couples, having children is the default position. Children are assumed until someone challenges that assumption. Four out of five women give birth. The number of childless couples is growing, but those of us without children are still the minority.

When you’re dating someone, I think it’s natural to assume you’re both planning to have children someday—unless someone says something. And that’s the thing. It’s an awkward conversation, could be a date-stopper or a relationship-killer, but someone has to ask the questions. Do you want children? Are you able to have children? How will you feel if I get pregnant? How will you feel if I never do? You both need to honestly say how you feel about it: I really don’t want children. Or I want children so badly that I don’t want to live without them.

If you’re not going with the default position of having children, someone has to say it. And not after the wedding flowers have already been ordered. People can feel the way they want to feel. That’s fine. Just say it before it’s too late. Please.

Yes, folks change their minds. But—and this is the old Catholic lady talking—if you agreed to children before you got married, you can’t break that contract later. That’s just selfish and you shouldn’t hurt someone you love that way.

I expect some difficult comments. My back is in bad shape today, and I hurt too much to be diplomatic. So let the comments fly.