This is the danger of these call girl type operations. If she gets busted, she'll cough up the black book in a deal to get her own charges reduced. It happens with far bigger operations than her little gig. The madam will publicly threaten the release of names, and every dude in that book starts shitting himself. If you get a grandstanding prosecutor, they'll try to ruin guy's lives just for kicks. This is somewhat safer than fucking with streetwalkers (if you get busted in your car, some cities will publish your name in the paper, try to confiscate your car, etc.), but it's still risky. Why she recorded the sessions is baffling though. Did she do it for security purposes? If so, after she was done she should have erased the footage.