Can porn higher your expections of sex [I Watch Porn By Myself]

ok as a female yes I watch porn to keep myself happy and enjoy it now and then.
But I have a few questions.... Can porn lower your expectation of sex or higher like unrealistic?

Also is it true people in a relationship still watch porn solo?
Can watching porn make to do less sexual stuff as a couple than solo? just curious.
Can porn become a replacement for sex?
Is it hard work having sex as a couple than Solo masturbation?