All these arguments about unprotected sex are totally missing the OP's point.
We KNOW that men should take more responsibility, and we also KNOW that they don't. And that there are men who might want to but are incapable due to mental health issues, addiction issues, criminality, low intelligence, unemployability, the list goes on. And yet women willingly shag these poor speciments, become pregnant by them and then stand around going "woe is me, woe is me." It boggles the mind.
As a woman who has been sexually active for 40 years, I know that whether or not to become pregnant is (or was, that ship has sailed) 100 percent my choice. Always. Every month. I enjoyed many a fling in addition to LTR but would never, ever leave myself vulnerable to getting pregnant by some loser because it was 'his turn to manage contraception' or whatever these daft arguments are. I made sure ironclad methods were used by me and that I had enough money for an abortion if something untoward happened.
And more importantly, I would never foist a resentful, unwilling, begrudging, disinterested father on my own offspring -- not in a million years. Which is why it was important to me to take total control over my own fertility and reproduction.
Why set a child up for that miserable life? Why not have your precious kids with the best possible man, even if it means being alone at times and exerting yourself to be independent and to take time to get to know the men you do date before exposing yourself to potential pregnancy?
Whether or not a man should be interested in the fruits of his recreational sense is beside the point. They should but they aren't. Knowingly procreating with unsuitable sperm donors and then expecting sympathy for being a 'struggling lone parent' like it just happened to you out of the blue is disingenuous and obnoxious.
Hold out for better, women!! Take charge of your reproduction and don't let any old loser impregnate you. They don't CARE and they won't bear the brunt of an unplanned pregnancy, you will. Stop thinking "in an ideal world..." and live in the reality of today.
And if you are against termination, you might want to step away from recreational sex with men you barely know, men of low character, men who can't earn, men who are addicts and men with a trail of broken commitments in their past. It won't end well and you aren't going to "change him." He's not going to "change when we have one of our own." The odds are that he will go on his merry way and you'll end up poor, exhausted, broken and with a one-parent child.