I grew up in a small town pretty much in the middle of nowhere, not many people and not much to do. The only thing of note was a small army base located a few minutes out of town. The residents of the base would often come to the town on weekends and hang around in bars and cafes, they were all young, often far from home, and also bored out of their minds.
One of the few pastimes for us in high school, especially the girls, was to hang out with them and do stupid things all day. In my last year of school me and my best friend at the time befriend a pair of cute young soldiers. Initially we were just friends but not long after we started fooling around. We started having sex all together as often as possible, usually at our apartments.
Soon one of them suggested we sneak in their barracks at night so that we could fool around during the week. He said security was terrible and most people wouldn’t care. I liked how adventurous that sounded so I immediately agreed. I initially convinced my best friend to come as well but she later changed her mind.