In case you did not notice in this Gossip Girl trailer (which by the way, came straight from CW themselves), in the first season of the show, these characters are supposed to be juniors in high school. And although most juniors would be 16-17 years old, the characters in the show are always running about town, going to clubs, bars, drinking uncontrollably, doing drugs, and having lots of sex with each other.
This show is watched by almost 4 million people (1). That is a crazy number. Especially telling is that the targeted demographic of the show is teenaged girls. When people see things on TV, especially at a young age, they want to emulate the behavior they observe, thinking it might make them “cool,” or help them to fit in, like the characters in the show. However, most teens have parents that watch over them slightly better than the parents of Gossip Girl; they are not able to fully engage in all of the activities in the same way that the characters of the show do.
When these kids arrive at college, they are pretty much given a free pass to do whatever they like, and for some, that means promiscuous sex. As someone mentioned earlier in a comment, for many, college is the first time that students are not watched over 24/7, and sometimes they get carried away with their newfound freedom. So American youth culture may also have something to do with what is deemed acceptable and what isn’t, and what kinds of activities teens desire to engage themselves in.
Although this blog has been just a brief overview of this topic, I hope it has shed some light on the phenomenon of people having sex in public. I tried to be broad with my research, and after looking a little at female and male sexuality, desire, sexual scripts, exhibitionism, voyeurism, sexual identity, as well as American youth culture, I have realized that this issue goes so much deeper than the aspects I have discussed. There are books and books that deal with each one of these topics, and although the information available is vast, I hope I have been able to summarize it accurately, and with the information I have provided, help others to understand why these practices take place.
(1) "Gossip Girl' hits record high, 'Terminator' declines." Entertainment Weekly 16 Sept. 2008. Hollywood Insider. 16 Sept. 2008. Entertainment Weekly. 4 Dec. 2008