If it really matters, there ain't much stopping you from creating an account specifically for porn consumption, nor is there much stopping you from setting up a

If it really matters, there ain't much stopping you from creating an account specifically for porn consumption, nor is there much stopping you from setting up a secondary browser profile to keep that isolated from any other ad-relevant data (Firefox makes this dead simple with Containers, but any OS worth its salt these days has support for multiple logins and the ability to switch users without logging out).