Opting out of motherhood is a very complex decision.

Outside of both of you misrepresenting the real statistics...

1. It's difficult to find a male counterpart to achieve this goal.

2. Some women (& men) are mentally volatile to the point they don't feel fit to be mothers.

3. Family support behind the woman can be lacking which could deter them & this is a natural instinct - it takes a village.

4. Some people live in a terrible location, environment can change you big time - maybe if they moved out of mega cities they would be more willing.

Its fairly uncommon to find someone outside of this purview who has a willing husband, simply opting out.