Regulating the amount of children you have is a loving act.

If you have children already you maximise the time and resources you can allocate to those children and if you haven't you can pick a time when you are better prepared financially and emotionally to start a family or pick never to have them if you believe that to be for the best while still enjoying sexual physical intimacy.

It's also wise to not fill up the planet too quickly with humans with there funny ways without a viable method of moving them elsewhere when space and resources start to run out.