People are a lot more promiscuous today. I've lived a long time. It's definitely different. If a woman was having sex in the old days before the Pill, it was most likely with the person she ended up marrying, either because they had that understanding or because she got pregnant.
Well my dad and most of the family I gleaned this knowledge from were born in the 20’s and I wouldn’t be surprised to find out i have a few hundred close relatives I don’t know about.