Bisexual tart or simply a charismatic Texan: 22 year old Justine is more relaxed teaching sexuality than people twice her age. She keeps it clean. She has a good deal of "experience" and she is not afraid to share her knowledge. Often for demonstrations, she enlists her girlfriend to simulate the male role.
Master and Johnson, this is not. But I think it is fair to say that everyone is potentially an expert in this field. And who might emerge as the next Doctor Ruth is anyone's guess. The opportunity to improve the quality of genuine, non-pornographic sexual education is enormous and exciting.