I've seen a number of great female orgasms on film (i believe that they were genuine). Some of the best coming from the "Screaming Orgasms" series from New Sensations where many top pornstars ride the sybian. Luna Lane, Angela Crystal, Brooke Balentyne, and my favorite pornstar Stevie had some great scenes. My only problem with this series is that it had a lot of P.O.V. camera views, which isn't the best view when you are trying to see a girl have a orgasm. My all time favorite orgasm was with Tina Tyler in the video "Gangbang Girl #10". Watching her convulse as she got off and then thanking the guy after she was finished was classic.