Well, with a surname like mine, believe me I've heard it all! My favourite was Salt'n'Shake, though there were a few ruder ones too. What did I do? Tended to laugh it off and then get down to business. They're kids - and I used to do the same. However, there's a sexual harassment element to your situation that you should deal with as forcefully as possible if it ever becomes overt and you can pin it down - which is sometimes difficult. Actually, it's a lot more childish when adults do it - as an abusive poster on here tried to do once.