The only person that I think did something "wrong", was the first person who discovered them and shared with others. Everyone else is fine.
As a guy, I would have watched if others were already watching. However, I would not have watched if I were the only person. That would be creepy.
Now, as for all your girlfriends watching and only one guy.....where do ya'll live and when is your next party? You guys sound like a lot of fun!