Philosophy is real. But if you knew anything about philosophy, you'd know it's not "this is immoral because I say so".

99% of modern morality is "because I said so". If that's the level of thinking you're applying to things, then you are a stupid person. Sorry.

There are plenty of legitimate arguments against porn. "Ughhh sex icky!!" is not one of them. Purity is not an argument. Religion is not an argument. Saying something is immoral is not an argument.