Tom,
I practiced law for roughly ten years, so yes, I have personal experience with some of these areas. The 16-17- 18-19-year-olds having sex with 14-15-year-olds came up all the time. Legally speaking, when you choose to participate in some sort of sexual activity you are strictly liable for any crimes you may have committed even though you may have not known you were committing a crime at the time. The moral of the story is to tell the young men in your life to card their partners. Tell the old pervs in your life, like Kraft, to make sure the people they hire to service them aren't doing so under duress.
When the prosecutor discussed Kraft on Mondy I was glad he mentioned Kraft could have been charged with participating in sex trafficking but they decided to give him and all the other Johns a break because of the expense and difficulty in prosecuting cases like that.