I was a passenger in a friends car, and as a dare I stripped naked and jacked off on the 405 Freeway California! Got many thumbs up from lots of people in the fast lane.
In the car while driving.
Hand job from my wife while I'm driving, several times.
On my boat near the shore while my wife encouraged me.
On a golf course.
At the beach.
Front yard at night.
Back yard any time.
Hot tub.
Swimming pool.
A few more that I can't recall right now.
It's probably been done, but have wondered about public spa and saunas .. specially here in Australia.. lol... some ppl here are just prudish
That would be in my office at work
Cab of big truck while driving down I-81 in Va.
In a park. Was in a jockstrap with a butt plug in me and a cock ring on. Hard as a rock and leaking buckets into the jock. Pulled my cock out and came all over myself. Rubbed it into me, stayed super hard, ended up cumming 3 times. Hard again now just thinking about it, need to do it again.
Just thought of another one. I'm not sure this would officially qualify as masturbation since I was not touching myself. I consider it a form of mental masturbation, or possibly like Linda Lovelace in one of her porn movies, I have a clit in my throat. Either way it gives me very good orgasms with 3 or 4 waves in each orgasm.
Hubbie was, he is now retired, an over the road Locomotive Engineer for a major Class One Railroad out of New Orleans. On their return trip back to New Orleans, if they had enough time left in their crew day, they would sometimes deliver their train to a connecting railroad. One of the routes passed right in front of my childhood home.
While waiting for a route to cross the Mississippi River, Hubbie called me at my mother's house and told me he would pick me up if I wanted to ride down through the French Quarter with him. It was a beautiful clear spring afternoon. He also let me know it had been OKed by his boss.
He picked me up at a crossing close to my mother's. Shortly after I sat down on the firemans side of the engine, the head brakeman went to ride on the second unit. He said he wanted to give us the engine cab to ourselves. As we crossed Canal Street and entering the French Quarter, Hubbie suggested that I give him a blow job. He did not have to ask twice. He turned his seat facing the firemans side and laid a newspaper down for me to kneel on. Those floors are rather dirty and usually have some oil on them that get tracked in by the crews.
As he pulled his cock out I went down on him like a hungry calf going for it mother's tit. It only took a minute or two until I started cuming. I usually have my own orgasms when giving a guy a blow job without any other stimulation. It happened the first time I gave a blow job to my first boyfriend / lover. And probably about 90% of the blow jobs ever since. In the middle of my 3rd or 4th orgasm Hubbie shot his load down my throat.
It was also one of the oddest scenes I have been in. While I was blowing Hubbie, he still had to blow the horn at all the crossings, slow his speed down to 10 MPH for a slow order, then back up to the 20 MPH max speed, and talk on the radio. Talk about multi tasking.
What a wild ride! A big thank you to the head brakeman for giving us the opportunity to put yet another erotic memory keeper in my mind. These types of adventures can and do spice up our sex life. It could spice up your's too. Try it sometime. If you don't have access to a train, try a car with a front bench seat. Or get a driver and use the back seat.
Brandie
Awwww Hell, I am such a nerd..... I haven't done anything as exciting as that......
Driving down various freeways
Storage room in a few different workplaces
Balcony of my apartment at night
Sitting in my car, parked in a residential neighborhood during my lunch break
Under a blanket on a flight
In the bathroom at work, on a flight, on a bus, on a train
In the hot tub and in the shower at the gym
Outdoors in natural settings while on hikes
I'll probably come up with a couple more at some point...
Pool party at MERTZ place while lounging on swan floatie.
In the bathroom of an HIV awareness conference.
My left hand. My right hand is violently jealous. It wasn't pretty.
Riskiest? Or craziest? On a dare, another girl and I masturbated at a party with a bunch of our friends watching us to see which of us could cum the fastest.
On a playground swing at a park at 2am.
sitting in the back of Sunday school class next to my girlfriend, sitting in car in front of grocery store front row watching shoppers walk by
I was on the U.T.A Front runner from Ogden to Salt Lake. my cock in hand and my dildo in my asshole. I was awesome, and talk about a complete turn on. I plan on doing it again. 
