The girls decide to make a public confession of their sex life in order to spread the word about what they've been up to. They're not going to let anyone else know about it, so they're going to have to make it public. The girls want to make sure that everyone in the world knows about what's going on, and they want to show it to the world. They don't want anyone to think that the girls are lying about their sex lives. They want everyone to know that they have been having sex, too, and that it's all part of a plot to get them to have sex with each other. The guys are all, "Gee, that's a good idea. Let's just let it go." The girls are all like, "Fine, let's do it." The boys are all "Fine. We'll let you do whatever you want." They'll just have to beat him up until he's ready to confess.