How do you know that when you touch a chair that that sensation is real?

https://en.wikipedia.org/wiki/Qualia[1] - is what you are now describing mixed with a little bit of Maxwell's Demon[2] - something is intercepting between you and a true experience.

Real, in the way I believe you are trying to express, is a complicated topic.

1 - https://en.wikipedia.org/wiki/Qualia 2 - https://en.wikipedia.org/wiki/Maxwell%27s_demon

I'm nit picking here, but I think you meant Cartesian demon?

Those are independent. Having root access does not mean that other parties do, but more importantly, NOT having root does not mean AT ALL that other parties don't.

This doesn't follow at all. Those other parties cannot authenticate as me.

Porn's main customer historically has been men, so it predominantly has fulfilled male needs.

In broad brush strokes : Women know what arouses men from watching porn. Men know what arouses themselves from watching porn.