Not really, most of them don't even enjoy the sex as much as you think they do, I bet an amateur girl could give you a better time in bed if that's what you're after.
Why wouldn't you? What makes a pornstar different from any other girl?
Nothing makes them different, it's just that some people such as I see sex as something both physical and emotional. I would not feel comfortable knowing that my wife or partner has videos of herself online with other men performing such acts. Obviously the larger conversation will arise later if we decided to have children for example and how they would take the news. But pornstars are not different to any women at all- it is just some people do not find it acceptable for a woman to be having sex on camera as a job, which is a perfectly justified belief.