Women who think a lot about having children tend to not have any. There's an element of recklessness to pregnancy.
Discussion
Can you explain to me what you mean by recklessness?
Willingness to throw caution to the wind, rather than trying to always protect yourself against all pain or suffering. Pregnancy is hard and can be dangerous and afterward you have a responsibility for 18 years. Women who think too deeply about that, are scared of motherhood.