This was years ago, on holiday with my parents (a sign of things to come!)
We were in a beautiful natural coastal area, and besides masturbating compulsively every day I would also go out for afternoon walks by myself. One afternoon, deep in the forest, I discovered this big clearing high above the beach. I stepped out into the sunshine and felt the cool breeze. There was absolutely no one around.
I couldn't resist - I slipped off my shirt and shorts, and stood in my underwear feeling the sun and wind on my skin. It felt amazing, but after walking around like this for a couple of minutes and hearing the dead silence around me I started thinking about something I'd fantasised about for months.
I took a deep breath and slipped out of my underwear, and stood in the clearing completely naked. It was such a rush! Despite the very low risk of being seen, the feeling of danger was still a massive turn on and before I knew it I was rock hard and masturbating in the middle of the clearing. I came hard and lay for about 10 minutes in a daze in the sun.
I couldn't stop fantasizing about the experience, and the very next day I went back. First however, I had a very long and messy shower in which I shaved off all my pubes. It wasn't the first time I'd done it, and I always felt guilty afterwards, but I couldn't kick the idea that the experience would be even more thrilling and exciting. I was right! This time I almost got caught though - I was so turned on, and in absolute bliss after removing all my clothes, that I didn't see a group of walkers emerging through the trees. I eventually escaped without being seen, but this experienced paved the way for my future exhibitionist activities!