In the past I have found the reverse phone look-up to be helpful--in part because it might tell you how doesn't know what they are doing and who might not be being careful enough for their own good and my own.

However, in the past few months, it seems that all the sites that offer this service make you pay to give you any results.

anyone know of a free site still offering this?

Try www.argali.com  They do have a free edition.

www.whitepages.com is still free and very useful.

try anywho.com

You can "pay" in many ways and on many levels of information. The 'net is but one source. The ladies who are staying in the business long term should consider at the very least an LLC and other means to hide ANY ownership of significance. This protects all concerned unless someone narks on you and once compromised, their black book goes too. Gentleman, know that and know that you can't control what happens and when.

try yellowbook.com