I don't know if you call masturbation a fetish, but I really have a fetish for it. Especially jacking in front of women. It is such a rush for me to get naked in front of a woman and show her my extreme hardon. I love it when they watch as I jack off. I feel like an exhibitionist, especially when they are still fully clothed.
In my single years I had no problem finding women to watch me. Surprisingly, many of the women who have watched me were really just good friends not lovers. Over the years I've confided in many women friends that it is a big turn on for me to jack off while being watched. I have followed that statement up with something like 'I'd love for you to watch me ... just for fun ... no strings attached.' Most laughed and said 'you're crazy!' ... but usually followed that up with 'yeah, I guess I'd like to watch you.'
So usually in the privacy or my place or theirs, and quite often without making out and getting all hot because they are just friends who want to watch this, I will begin usually seated and as I talk to them I start feeling myself with a hand as my dick grows hard. Usually they sit with large smiles on their faces. Then I will stand and undress in front of them until I'm totally naked. I prefer this for comfort as well as visual effect. I love it when they stare at my dick and smile and say nice things. I may stand in front of them, or sit beside them on the couch. Either way they get a good close view. As I jack I tell them how good it feels and how excited I feel doing it in front of them.
About 50% of the time I have been able to get the woman to get naked too or at least partially naked to give me something to look at, but it is still a rush to me if they are fully dressed. I love to cum and send my juice squirting in front of them. I have heard 'Nice!' and 'Awesome!' and all kinds of good comments.
When I married at a rather late age of 35 I was fortunate to marry a woman who also loves to masturbate. We frequently lay on the bed together and get ourselves off in front of each other. At other times, if I am really horny for example, I may be watching TV and tell her I feel like jacking off and I'll pull it out and jack off in front of her as she keeps one eye on me and the other eye on the TV! She doesn't find this wrong at all. I have a great woman!