The current arrangement (ETA: i mean legal situation) is that both parents have custodial rights and financial obligation to a child after it's born.

Abortion let's women have an extra out from a child disrupting their finances and time. Men can opt out of time (but it carries social stigma of being a deadbeat) but not finances (a couple hundred for most but that's a good chunk for most young adults nowadays).

(This part in parenthesis is a guess but a financial link keeps you aware that you have a kid out there which can lead to popping back in life later which is bad for both the dude and kid)

PS/FA is proposed to equalise the consequences of sex. The proposed method is a window shorter than the period in which a woman is allowed to have a abortion which would lead to the mother now making the choice to be a single mother or having to go through a abortion.

It sounds great but this causes a different inequality due to burden of pregnancy. It's not fair on women to expect to have to share parental rights of the baby with a man who's only contribution is sperm.

And now for you to establish a truly equal system you'd have to declare the male's parental rights to be of the mother's choice to give or not**. This can also screw over men who would have to know they have a kid out there and they have no rights to see them or similar things.**

A fix would be to establish financial and material support since the start of pregnancy, even reimbursement for at least half the cost of pregnancy if found later. But a flaw is that we are equating money with rights to a human which doesn't hold up on some thinking and it wouldn't hold up.

Essentially the proposed direction of changes (in favor of pure autonomy and rights) to the current system (that's based on feelings and morality) can lead to this dystopia and men are fucked in this regard either way.

(Also this was for the singles, the current system for the married is good enough married men can just shoot in 7 cups, freeze it, get vasectomy or fuck themselves. Women should not be trusted about what they say they will do if they get pregnant if they have never done it before and even then you can't be sure if they will be okay with it just because that was what you agreed on.)