https://ageverification.dev/

"The European Commission is developing a harmonized, EU-wide approach to age verification, accompanied by a comprehensive age verification blueprint that is intended to facilitate practical adoption across all Member States and can be customised to the national context. Built upon the robust European Digital Identity Wallet framework, this user-friendly and privacy-preserving age verification solution enables individuals to demonstrate their eligibility for age-restricted online services, such as those restricted to adults, without disclosing more personal information than absolutely necessary"

So basically, the intention is to provide a solution where users do not need an account or to provide their passports to BigBootyXXX.com. The site just asks if this session or user is of legal age and the age verification system will respond with a TRUE/FALSE