Oh and for the record, they weren’t all virgins even during my Grandparents Era either... go have an honest talk with someone in their 80s and you’ll learn a lot.
Yes, risks were different, if she got pregnant, you married her... or she got shipped off to a “a cousins house” (convent) until the child was born a put into the home or adopted....
But don’t kid yourself that stuff wasn’t going on prior to the wedding night.
I don’t pretend that no extramarital activity happened in those days, but the situation compared to today’s hypersexualized environment is night and day.