My wife and I managed to have sex for 9 years without conceiving a child, and could have continued that indefinitely. Having children wasn't a side effect of some other motivation. It was a conscious decision based on the fact that we both wanted a child, and felt we had reached a point in our lives where we could raise one well. When we decided to have a second child five years later that was also a decision based on what we wanted in our lives.
That's very true, and will remain true so long as the political landscape is dominated by statists.