I think my boss is sexting young girls

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I work as a waitress in a members club where people bring their families especially on weekends. However, I have noticed something strange with the chairman of the club that is really troubling me. I have often seen him giving his number to the teenage girls who come with their parents to the club. I think he later calls them and I suspect he may be sexually assaulting them. I cannot tell anyone because I will be fired in a matter of minutes but I want to do something for the sake of those girls. He is very influential at the club and is known as a womanizer even preying on peoples wives. I really want to do something especially for the girls but I don't know what. Please advise... {Wendy}