When I was growing up I shared a room with my little brother so I had to be discrete when I masturbated. I would try to wait until I thought he was asleep before I did and would try to be as quiet as possible, which was kind of hard when in the heat of sexual arousal and orgasm.
One day I was out in the woods behind our place throwing rocks in the creek and just generally being bored. As I was walking back up the hill towards home out of nowhere the thought of wanting sexual release crossed my mind and I decided I would masturbate that night. Suddenly I thought, why wait until then, I could do it right here. There was plenty of cover from the trees and thee was never anybody down there to worry about.
I found a suitable spot but there was all kinds of pine needles so I just pulled down my pants and already being semi-erect, began to masturbate. The whole idea of masturbating outside was pretty erotic and even the the idea that I could be seen although slim to none added to the eroticism. It didn't take long before I climaxed, shooting my sperm on the ground in front of me.
The whole experience was so erotic that from then on I sought to find different places to masturbate and then when I became sexually active with women I liked to make love outside or in different places other than just the bedroom.
I eventually found a really good place in those woods that when the sun was just right would shine on a patch of nice tall grass where I could lay down and feel the warmth of the sun. The added pleasure of having this bright 'spotlight' on me was an added bonus.