I don't agree with pedro2 about this being a judgment call, especially for teens.
I know you know this already Easterinbelize... but do remember they are 16 year old girls and you are the responsible adult. You are responsible for them! Make a stand for their safety.
Heck... Marty (the webmaster) knows MANY people on Island and his family has visited many times over the years... you already read what he said!