This is what I don't get about this whole porn thing

So if your significant other was watching a girl he knew masturbate or fuck someone else it would be considered cheating but if he doesn't know the girl and it's her job to masturbate and fuck people it's not cheating? Lmao. No no no honey it's ok if you watch this other girl to get off because she gets paid to be a slut but if you ever ask another girl to send u naked pics and I catch you then you're gone!!!