Until there is zero societal stigma towards sex and legal sexual preferences, mandatory age verification for adult content is completely unacceptable.

Mandatory age verification for adult content should be illegal.

Quite. The age verification for social media may actually be worse, because the age requirement is lower, meaning they have to collect personally identifying information on minors. Many young people also don't have ID, particularly in the UK where driving is less common. Actually, many adults don't have ID in general. Every free vBulletin form also just got thirty cents per user more expensive to run.