Most of my guy and girl friends that are sexually active and single, have had a one night stand. (ages 18-24) That's all it is. The guy and girl enjoys each other's company, satisfying their needs, and then go their separate ways. Subjectively speaking, I see nothing "wrong" with it. If you're religious, then I understand since you may wait till marriage. Of course, everyone is different. It's easy for me to say that, I'm a manwhore. Some people have to be emotionally invested to even sleep with someone.