Yes you should ID her. The age of consent doesn't mean shit if you are paying her for sex. Most states, like Georgia, have charges like "sexual exploitation of a minor". If you pay a child under the age of 18 for sex and get caught you can spend some serious time in Jail.
Don't take my word for it. Below is a current prision photo of a a guy I used to know, Jason Chadwick Ford (GA Dept Corrections #: 0000822789). He paid a 16 year old girl for sex and got 8 years. His legal defense was that she was of the age of consent. He's serveing his time in the Baldwin State Prison in Georgia.
