A first look at the age verification implementations of Satin Silk Fun, MySatin, Only Silk And Satin, SatinPlay, Vanaweb and Sexy Satin Silk Fun. This starts as rulings such as the UK Online Safety Act are coming into force.
The simplest option will be a credit card for subscriptions. Face scans and ID document checks are the alternative.
Enforcement over user to user content will also see limits to free areas and forums. A VPN would work around any IP geolocation blockages.