Sex has long been a far more casual activity than commonly portrayed. So, people often have huge misconceptions about people's behavior both past and present.
When I have spoken about sex with people older than myself, I have sometimes been told "Well, TV went off at 9pm and there just wasn't anything else interesting to do between 9pm and going to sleep" or words to that effect. (Hippies explained: "It was 9pm and we were bored.") Similarly, I knew someone who traveled a lot for work and casual hookups were just a thing to do when trapped in a hotel in the middle of nowhere.
