The best sex whether PS or GF is when (there is a natural chemistry and) when it's just the two of you (or a couple of her friends
), and I kind of look at the camera (person or tripod/POV) as a third person to whom you're trying to be an exhibitionist, so to speak. So for me, I'm more turned on when there is no camera or I can forget the camera is there (thought I can not do this and hope to capture anything good).
My difficulty in getting turned on is when I'm reminded (usually by poor performance) that she is only there because she is paid to be. Fortunately, I rarely get those, but when I do, I'm thinking. "Bitch, I don't need you to fake an orgasm, but can you at least not trample on my fragile ego, and pretend you want to be here, at least when the camera is on??" lol Conversely, the magic happens when she teases you or even fucks you when the camera isn't on or kisses you passionately and holds on to you long after the scene is over. My philosophy is that I only need to fall in love a couple of hours at a time, but those are the ones that steal a little bit of your head and your heart, and I've used those (rare) moments as mental viagra on days I'm not feeling strong.