[meitham]

This ban targets children, prohibition covered adults! This more like requiring proof of id when you purchase alcohol

[debugnik]

Except by ogling your ID, the attendant isn't making a copy and linking it to your purchase in a database that will get breached, or shared with the wrong future government.

[samtheDamned]

This isn't the same due to the sensitive nature of pornography consumption but in the US this is exactly what happens when you buy certain cold medicines (pseudoephedrine specifically)