mummynetter does have a point though, of course there are elements of manipulation, abuse of trust, power play and deviousness, but .....oh God how to say this.....teenage boys do have a sexual energy that they need to put somewhere and if offered a release that is even slightly conventional (albeit with an adult) then the boys may see it as a tow way thing.
I am prepared to be shot down in flames and I 'm sorry if I've come across as insentsitive.
You're not dadslib are you mummynetter?