Here is the relevant part of the NC rape shield law.
It won't matter whether the AV made an inconsistent statement or not. Any sexual activity recent enough to show up in a vaginal swab is almost certainly going to be allowed in as probative of the assertion that that activity accounted for the genital injuries, and not the alleged rape by the lacrosse players. A trial judge should clearly allow this in, and even if he or she did not, the defense would have a very good argument on appeal.
Slam dunk SirJohnBarleycorn!
I'm just glad you're not SirLowSparkofHIghHeelBoys
Mark.