On the other hand, watching porns makes either make people horny or uncomfortable depending on their situation.
For teenagers maybe. Most adults can regulate their emotions enough to handle it. I mean, if you watch movies with your mother on a regular basis just laugh akwardly over all the scenes she doesn’t want you to see and that’s it. With anyone else, why does it bother you if they’re watching with a smirk? It’s not like people break out into orgies watching a small sex scene.
I think what’s happening with people getting overly irritated with sex scenes in movies is, in last consequence, the habit of puritan self-censorship. “Oh, we shouldn’t watch that and be aroused by it, that’s so indicent. I will be embarrassed if someone catches me doing such a shameful thing.”
Once you accept how normal and beautiful human sexuality is, sex scenes become just that - normal. A realistic part of the stories we like to be told.