> Are you saying there is absolutely no way to perform this action online in a way that respects privacy just the same as all of those operations? No way at all to do a verification that's immediately tossed in a privacy preserving way?

There's ways yes but the bigger issue is that it's much harder to verify. When I show my ID to a cashier I can see whether they photocopy it or not. I can't verify websites and porn ones could be shady.

Not that I personally care that people know I watch porn. But maybe people do care.