This attitude has probably hung on longer than I suggested in the comment above - it's also all over The Crown, multiple characters who can't marry the person they love because that person is (gasp!) DIVORCED. To the extent that it is dead (I'm sure it still hangs on some places), it took most of the twentieth century dying a long, slow death.

I'm contemplating writing a post about 19th century sexual attitudes, because I feel like in general people today expect them to be deeply exercised about things they didn't spend a lot of time fretting about (LGBTQ+ issues) and ignore the things that actually gave them vapors: divorce! prostitutes! painted women! masturbation.