That's really a bullshit argument. First off, there are plenty of technical solutions that allow minors (15-17 years old) to bypass the restrictions: using sites that don't follow the law, using Tor, etc. But furthermore, these measures to restrict access to porn are counterproductive for sex workers, because it makes their situation more precarious, and they only exist to weaponize the "think of the children" narrative in order to push draconian laws and social control. Soon it will be social media's turn, and then the entire internet asking for an ID. This isn't just an empty "slippery slope" argument, it's exactly what regulators are currently doing in all Western countries.