Sororities have a long a good spanking history. Now there is one where you can officially talk about bdsm. The University of Ghent acknowledged the student club Kajira as an official Sorority. The are not allowed to practice bdsm on the campus but this is a big step of getting bdsm more accepted.
You can read all about Kajira on there website.
More Kajira in the news: Cursor (dutch) and universonline (dutch) and pownews (dutch)