I have heard this argument before, and I honestly do not find it convincing. Giving birth is part of human biology and it is something only women can do, just like men are the ones who serve compulsory National Service. One is a biological reality, the other is a policy choice. Using something that is rooted in anatomy, which men cannot change, as a moral leverage in a relationship is not a strong or fair argument.
If someone wants to talk about contribution and partnership, then the conversation should be about shared responsibilities and mutual support, not “I do something you physically cannot, therefore I automatically deserve more.” That logic does not hold up. Women can also volunteer for NS, and many choose not to. So if the point is about contribution by choice, then it should apply on both sides.
A healthy relationship or marriage is built on what both parties bring to the table, not on scoring points based on things people cannot control.