Why? You do that.
My statement stands. Elderado stated that "it is not assault if it is consensual" and I added the comment that something is still a felony if a minor is involved. That is a proper statement about the law. How that law applies to Barney's circumstances is not something I have weighed in on one way or the other.
I am happy to not know that much about his sexual partners and to keep it that way. Most likely you keep lots of information on that type of thing so if it does not apply to Barney, fine.