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To quote the writer Anne Lamott: “It is a moral necessity that we not be forced to bring children into the world for whom we cannot be responsible and adoring and present. We must not inflict life on children who will be resented; we must not inflict unwanted children on society.”
Having sex is not an automatic consent or choice to become pregnant or become a parent.

Women should not have to be nuns in order to avoid unwanted pregnancy.
Having sex is not a contract to become a parent. If it were, it would always result in pregnancy and women would always choose to carry to term. Plenty of people have sex every day without wanting or hoping to conceive. This is about women’s bodily autonomy. As long as the fetus is a dependent part of the woman’s body, it is HER CHOICE what medical and life decisions she makes regarding her own body.
There are also plenty of women who have had kids that are terrible parents and their children suffer for it. But this society has a paternalistic fixation that a zygote supersedes an already born, adult woman. Unless you want to outlaw sex outside of marriage (and let’s not get into how wrongheaded it is to have a child in order to save a relationship), women will conceive without wanting to, or wanting to continue the pregnancy.