A similar system was attempted in the UK. The controversial part here was that there would be some central body with potential knowledge of the sites you visit associated with your passport/credit card/ official license. In addition the potential for fraud in spoofing the verification process etc...

There was much humorous satire e.g. calling the Queen for access to porn. Before some tech contracts fell through and the whole system was abandoned at the end of the Theresa May government.

I was looking forward to the tertiary effect of kids becoming network experts in the next 20 years.

It might for example require reddit to ask you for your credit card before it lets you see an nsfw subreddit. And then again the same procedure on the target site. Not everyone is comfortable with giving adult websites their credit card information. (I for sure would not be.)

Many consider it bad to create a regulatory environment that leads to the creation of lists where real world identities are tied to specific sexual preferences.

This is because in the contemporary western world, sexual preferences are considered intimate and highly personal. Creating such a data basis enables future discrimination. It doesn't mandate it, just enables it.

There's a famous (and arguably untimely crass) example of such data gathering in the German past. It's different in scope and consequence (smaller scope, bigger consequences), but maybe still interesting.

Sadly there's no English Wikipedia article about it:

https://translate.google.com/translate?sl=de&tl=en&u=https%3...

(At least that's the memory of German school history classes I immediately recalled while reading the linked article.)