As someone squarely in the middle of the Boomer generation, I’d say my generation opened the door to sexuality as the late 60’s and 70’s were a time when drugs, hookups, partying, and rock music dominated our lives.
I completely agree about the internet’s contribution to the acceptance of anal and other kinks. I’m sure there are “how to engage in and enjoy anal sex” videos out there as well as increased depiction in porn. I became intrigued by anal when I saw a picture in my dad’s porn magazine. Then, I saw anal in a super 8 film we rented in college. Now, you can watch endless anal scenes on your screen.