I was more concerned about him calling the girls "Hot Chicks". I have no idea where that is coming from - school or t.v.? I have not heard that term in ages! However, I know that is also the normal for his age so I am not going to do an over the top reaction to it. I will just let him know that I don't think that is appropriate.
I think this was a case that they wanted to expand their non-business and couldn't find another boy who would do the secretary duties so decided that a girl may be willing. And, what better way to meet a girl than to offer her a non-paying position in their up and coming business?
At the school open house, a group of girls called him over and as they talked, he told them about his business. They asked what that meant and I explained that if they loose something the boys will help them find it. She said she would go home and loose something. I told her that it only worked with things lost on school property - that he would not be going off school grounds to "investigate" (missing pencils, calculators, stuff like that).
They started this "business" last Spring and never got a customer so I am not too concerned.