You know since you are very young, that it is wrong to do things with people against their will, and you also learn not to do it with minors. If you didn't learn or you didn't understand, all the more reason to "expose" you.
Having illegal relations is not an accident, it's an attitude and you don't simply change. You appear to change, but you do not actually change. It takes a long time to get up the courage to do something like this, then plan the actual act, then actually do it. These things are very much premeditated, you don't just change.
You either have it in you or you don't.
I will never ever trust anyone who has a --- offendors history with my kids, it is so not worth it!! Even if they did claim to change, well, to bad, this is my children and I would way rather err on the safe, maybe overprotective side.