Is it normal that my teenage son has sex in public?
I'm a single father of three teenage boys (they're 18, 17 and 15 years old). My 18 year old son is still in high school, and has been partying a lot lately. I recently found out that at one of the parties he had been to, he had been drinking and having sex in a room full of people.
One of his friends came up to me because he says he was concerned with how my son was behaving. He told me that at the party, a small group of them went upstairs to one of the bedrooms. They had been drinking, and my son was dared to doing something with on of the girls in the group. My son and one of the girls started making out, then suddenly they both got naked on the bed, and started having sex in front of the entire group. My son's friend said that while they were having sex, the room quickly filled up about 30 to 40 other students watching them and cheering them on. He even showed me a video on his phone, of my son getting oral sex and having sex with the girl doggy style on the bed, while the room was filled with people cheering him on.
Is this normal teenage behavior at parties, or should I talk to my son? I figured since he's 18, he's old enough and these things aren't a big deal anymore.