Many of the European student groups are coed, and they seem to delight in posting pictures of hazing - male and female - on web pages.
I would think adding women to the typical fraternity atmosphere (and perhaps a few women advisors and supervisors too) would be an improvement.
Especially in dress, manners, cleanliness, timeliness, and civility.
Some of the pictures I've seen from Europe, though, just show the girls getting crap dumped on them along with the boys. And many of the hazings seem to be in public, with non-members looking on. And most seem to have beer bottles in the members' hands.
Maybe co-ed wouldn't be an improvement.
Here's a picture site:
http://members.lycos.nl/gaypoeta/