I really enjoy watching a woman bring herself off. It took me 2 years before I could get my wife to masturbate to orgasm in front of me, and it wasn't like we weren't doing a lot of other things, including swinging with people. She said it just made her feel weird getting herself off with me watching. I think its sexy hot as hell, personally.
Check out this video, randy69 ... be sure to put it on full screen, too ....
https://www.tumblr.com/video/itsnatalieuk/128321383517/500/