It is a side issue, and one he & you apparently want to jump on to divert attention from the issues you want to avoid.
That issue, as explicated by well known libertarian, Murray Rothbard, that:
http://tigerboard.com/boards/view.php?message=18005229
For the child has his full rights of self-ownership when he demonstrates that he has them in nature — in short, when he leaves or "runs away" from home. Regardless of his age, we must grant to every child the absolute right to run away and to find new foster parents who will voluntarily adopt him, or to try to exist on his own. Parents may try to persuade the runaway child to return, but it is totally impermissible enslavement and an aggression upon his right of self-ownership for them to use force to compel him to return. The absolute right to run away is the child's ultimate expression of his right of self-ownership, regardless of age.
Are not the assertions by that teacher of libertarian classes at SUNY university consistent with Rothbard's assertions?
Using Rothbard's framework for the rights of children and of their rights of self-ownership, how would you answer the following questions that I asked below?
If a 12 year old girl wrote a book that became a best seller & she had the money to move out and get her own place, do you feel that under the rights of self-ownership she should be free to do so?
If so, would she not have the rights under self-ownership to engage in sex acts with whomever she wanted, without her parents coming and grabbing her by the arm and dragging her back to their home against her will?