It happened last year. I was very busy and alone at my lab. My balls required attention for the amount of stress I was having in there. I shut myself in a small room, pulled down my pants and masturbated right there. I made sure I didn't mess anything. I have masturbated in the forest next to ir a few times, but that time was INSIDE of the building.

 There was another situation, when I was 15. I was waiting my mother come in the building garage, but I was watching porn just before and was horny, so I masturbated in the shadows, so no one could see me in the cameras.

 I have masturbated in public places during night, so no one could find me. I want to do it again.