The unfortunate part of this industry, especially if you hire younger models, is that many are going to be in the same boat. I would feel especially bad if a model was homeless and had no where to go after the shoot. That hasn't happened to me yet, but I've thought about it.

If you live in a big city, you might gather up some pamplets from local clinics, shelters, HIV info, suicide hotlines, drug counseling, etc. just have on hand in your office.

If you treat the models with respect and don't exploit them, I feel that paying them to model is a good thing. My friend that used to counsel homeless youth took a sex-positive stance that he wouldn't discourage the kids from modeling, but only if they could handle it. It's better than picking up tricks on the street, selling drugs or stealing.