There is always more to be said, and I would be happy to answer any follow-up questions, but I've written a few answers that may be helpful to you here:

In Hamilton, in the song A Winter's Ball, Burr says "so many ladies to deflowered." How common was premarital sex in the colonies?

I've read that it was incredibly normal for brides to be pregnant in the 18th century, but in Pride and Prejudice a couple's implied sexual contact prior to their marriage is a huge scandal. Is this indicative of a moral class divide, or were 18th century values just not representative of reality?

Teenage love in the Victorian era

In Lady And The Tramp, there is a line from Lady's neighbors that boils down to 'one of us has to marry her to preserve her honor' after she's been hanging around Tramp too long. Was this mindset ever widespread in the U.S. (the movie's set in 1911)?

(That being said, I'm likely to come back and write you an entirely fresh response later. ;) )