Before Roe, the vast majority of women wouldn't put out unless they were married. They needed to make sure that the men they married were responsible men of good character.
Of course wealth distribution at that time allowed young people to get married and have kids at a young age. A young man who was willing to do a hard days work could afford to feed, clothe and keep a roof over his family's head.
Nowadays, we have to have 2 college grads with additional skills before anyone can afford to get married and have kids. People used to get married right after High School. Nowadays people don't get married until their late twenties or early thirties.
Instead of young women falling in love, getting married and starting a family, they all just want to go disco dancing and 'have sex' with strangers.
Notice how people use to 'make love', but nowadays they 'have sex' like dumb animals? A meaningless biological act that has no more significance then taking a crap.
Abortion is what enabled the shift of wealth away from young people, the end of young families, and the revision back to pagan sexuality.