But how do you filter him out from the other people labeled rapist/pedophile? You believe him on his word?
Go actually check the registry. First off in many places it's the opposite eg there is no crime of rape it's "aggravated sexual battery" or something similar. Which is heavy if you know any legal jargon but easy to miss if you don't.
And second it is overwhelmingly full of serious violent sex crimes and crimes against minors under 13. Even if you're in there looking for a case like you describe they're hard to find.
The drug war is the cause of almost all exaggerated or unjust convictions, not sex crimes.
I think Cody Wilson got put on the sex offender registry after he had sex with a 16 or 17 year old who presented a fake ID to a sugar daddy website, which was "verified" as being an 18 year old ID. So she verbally and via fake ID lied about being 18, consented, and even was acting in a "professional" capacity seeking out this activity. Cody was still convicted as a registered sex offender despite his best attempts to follow the of-age law and due diligence.
With strict liability, someone can look 18 and even show you an ID+passport and you can do mountains of due diligence but it is not a defense against the conviction. Pretty crazy we have people on the registry because of that IMO.