It is not unreasonable, given today's technology, to expect that a couple that actually intend to procreate could come to a prior agreement and sign a note to that effect. Just think how the current demographics of child birth might change if women knew prior to having sex with a man if he was going to pay child support.
This kind of proposal grates against soem leftists initial sensibilities, but if you think about its potential to improve outcomes for single women who currently see hooking a few baby-daddies as a viable career path the upside should become apparent. Forget about the moral posturing about who should be empowered with what degree of choice. It will make both genders become more honest about their intentions and think more proactively about when and why they procreate.
You have a one night stand with a guy and he leaves you a signed note that he will not pay child support. You make your decisions accordingly. It would result in a lot less pain and suffering in vulnerable demographics. Women would wait to be more financially secure before reproducing, and/or would tend to select more respectable men as fathers. You know, ones who actually sign the paper (intent to pay, not marriage) before doing the deed.
It's really ironic that the side that advocates for the divorce of the sex act from reproductive responsibility in general (and specifically for women) advocates so vociferously for the irrevocable welding of said responsibility with the sex act for men. I don't get how one can disavow moralizing for women and cling to it for men. In public policy matters, moralizing about sex is dead. Let's get on with that reality and have some equality in the matter.