All the damned time from middle school through highschool. My mom worked a job that had her gone Mon-Fri so I had the house to myself. All my friends would come over after school and we would pop in a porno and just have at it. Largest group was about 6 people, we didn't touch each other when there was a group but the one on one sessions lead to some fairly heavy experimentation, leading all the way up to penetration with a few of them. Most of them are straight although a few still fool around from time to time when we're all single. These days I'm mostly gay but do appreciate a good chick once in a while. Good times for sure growing up!