Listened through the tape three more times. Nothing on there says anything about him being molestated prior to 18. Not one thing. The key quote on the tape is this:
" And, it's hard ... " Fine said. "If it was another girl like I told you, it would be easy to step in because you know what you're up against. ... (When) it's another guy, you can't compete with that. It's just wrong, and you were a kid. You're a man now, but you were a kid then."
Everyone is just assuming kid means 12-18. Most likely it was 18-24 range being a "kid". "When it's another guy, you can't compete with that." Key word being compete and "You're a man now, but you were a kid then." It sounds like this was a consensiual relationship and she would have confronted not Bernie, but the other person.