many would argue it does harm others by messing with your sense of adult sexuality/proper sexual interaction with others

That's why we try to make it illegal for 12-year-olds to view porn. It's sort of insulting to imply though, that a 39-year-old isn't possessed of better judgment to know what's pleasant for fantasy and what's healthy in reality. The sincerely nice thing about porn is it's not required reading or viewing - adults can choose not to partake of it. Such as you've chosen not to do. Isn't that cool?