No.
You keep saying he was solicting. Maybe, maybe not. If the crime is not charged, it does not really exist as a precluding crime. We may speculate all we want, but unless tried and convicted, he is innocent of the speculated act. Even if the judge allows the speculation of criminal activity, the defense can use the lack of a charge as a rebuttal.
I used to manage a restaurant near an area heavily worked by prostitutes. We did all we could to get them off the streets, but it was difficult because the police are at a real disadvantage. Solicitation of prostitution is difficult to prove. Generally, it has to be witnessed by a police officer, and he must witness money being exchanged specifically for a sex act. Talking to a known prostitute in a location she is known to work, may get you questioned, but not charged unless you admit to the crime. It is not illegal to pay for time, conversation, entertainment (dance). He may pay for body lotion (expensive body lotion) and then ask her to apply it. If a sex act subsequently occurs, it must be proven that it was part of the initial contract and not simply a result of mutual attraction between two consenting adults. Generally the only way an officer can prove prostitution is in a sting.
And without admission of guilt and a resulting charge, there is no precluding crime, while the failure to deliver any of the promised legal services mentioned could be fraud as I previously described.