Do you have any data as to what percentage this group might represent?
I venture to say that it must be small. I've heard some say that they don't consider the offenders that have been convicted of sex with a teen to be as dangerous as those who choose children. If a man puts himself in that position then he got what he asked for imo.
No, data on the problem would be impossible since "everyone says they're innocent." I do know that it is a problem as I have seen many reports over the years of men that have been put through the wringer by their ex-wifes with this tactic. Sometimes there is enough evidence to show that the wife's claim is false, but unfortunately the man usually just pleads guilty in order to get a suspended sentence rather than risking 20 years in prison.
One of the news magazines had a very disturbing story a few years ago detailing how state child services therapists themselves coached children into giving testimony that they were molested by their father. They would give the child a treat if they said that their father touched them in certain places. The kids soon began to think that saying that their father touched them was the right thing to do.
The therapists justified their techniques by claiming that it was just a way of getting the child to open up and not be hesitant to say things against the father. I would hope that laws like this don't include men convicted of this type of accusation and instead focus on true predators.