I would love to masturbate in front of others but occasion never came up. I've been married for 30 years with a vanilla infrequent sex life. Wife not really interested in watching me but does so occasionally when I'm horny and she's not. She looks bored but I still enjoy it. She'd rather watch because I think she's too lazy
I think they can if they want to. However in that case it would be better to go to an adult theatre. There are lots of voyeur and exhibitionist opportunities there.
I have only been to a few adult theaters decades ago. I never seen or heard of anyone openly masturbating. I highly recommend you do NOT try to. Possibility of someone getting very upset at an unwanted sight.
In my twenties I did this several times despite being embarrassed, my girlfriend had a way of talking me into it. The wildest was in front of three women and two guys. I was close to orgasm when she lifted me as bisexual, I came really hard
In college I had a big window across from a college guy house and they would watch me. It was very exciting, love an audience!
I enjoy watching and being watched, Thats why I have a whereby room (seniorjo) and when nobody stops by I go to dirty roulette or a similar site.