Here's how I imagine the ideal system would work;
After unprotected sex, it's the duty of the woman to check for pregnancy within a reasonable amount of time & inform the male.
The male is now presented with the choice whether he wants to be part of the child's family, the male must make a decision before it's too late for an abortion.
The woman is informed that the male don't want to be a part of the family, the woman is now asked if she wants to proceed with the pregnancy knowing that she has to support the child herself.