It is supposed to happen when you do that. It's why we crave it. Many seem disinclined to acknowledge it, possibly for some political reasons. In most other cultures a child is considered to have two or more parents. Two people were equally involved, both must equally face that question, both having equal say.
Accountability is to each other.
Not to anything external. They were the ones who decided to get into bed with each other. Would seem a bit late. Not very responsible. Many men consider women too frail and delicate to be held accountable for their decisions.