Here are two which I enjoyed jerking off to. Both women use their thumb to help them masturbate. It's a technique I don't often see. I guess not all women have a long enough clit to make it work. My wife can do it. She calls it "thumbing off". When she's away I like to jerk off to videos where other women get off that way. I love the girl in the shower, even though it's not HD. The photography in the second (Nubiles) film is excellent and the woman is just gorgeous. Does she really have an orgasm? Does it matter?
http://xhamster.com/movies/3132059/msturbating_in_shower.html
http://www.youporn.com/watch/9369421/buried-fingers-make-tight-pussy-cum/?from=related3&al=2&from_id=8684103&pos=34