Yet more legalistic ducking and diving. However, if I was trying to be absolutely objective about this I would suggest that some of the distinctions they are implying are there to give them a route to allowing someone in very particular circumstances to avoid being labelled a molester. For example, in the UK it is possible for an 18 yr old to have consensual sex with a 15 year old and be convicted as a sex offender on the basis the legal age of consent in the uk is 16. They would be placed on the sex offenders register. Situations like this already are a matter of debate in secular society. I think the WT are trying to leave room for "discretion" in cases like this. Of course the risk is that much more could go under the radar.
Not condoning it - just saying like...