This was the time of our parents and grandparents, when sexual discussion and fantasy was the privilege of men. Which is why pool halls and barbershops were off-limits to my mother, when she grew up in small-town Canada.
It's not that we're any more or less dirty-minded than previous generations. We just brought it out in the open, where the differences between harmless jokes, sexist tripe, and serious harassment are exposed in the light.
Personally, I like it better that way.