You can take extra ordinary steps in protecting yourself from getting a criminal record.
1. Avoid "taking one for the team". If she isn't known, you are playing russian roulette. It's called due diligence. Google and website Search buttons are your friend.
- Continue if you skip step 1 
2. Avoid any ads that offer a sexual service or are with "escort" ads. That alone proves intent.
3. Make sure you have about $3000 on hand for a criminal lawyer.
4. Never discuss or elude to any type of sexual service.
5. Terminate the call if she eludes to any sexual service.
6. Save or record all correspondence to prove lack of intent.
7. When the door opens and 7 highly trained, heavily armed and well paid officers grab you, don't incriminate yourself. Do as they command, like providing your ID, but any questions regarding your actions should be only one answer, "Lawyer". Trying to talk your way out of it puts you at risk of blurting out something that can be held against you in a court of law.
Remember the police can arrest you and charge you at will, regardless of your guilt or innocence. It's up to the court system after that.
8. Carry a change of underwear in case you shit your pants when the door opens.
