There was an excellent article about this entire mess at bloomberg business week: http://www.bloomberg.com/news/features/2015-10-07/a-sex-scandal-rocks-stanford-s-business-school
I am sorry…I think it is creepy for a professor who gives out grades has the hots for a 20 year old. If she is no longer a student of his that is one thing but if she is a student in the class, it is weird and WRONG.