SMU is a deferred rush campus. I was an alum volunteer there a few times over the years when I lived in Dallas.
There's a hard and fast pecking order, and the social aspects go on year after year. SMU is in the Highland Park bubble, and if you went to SMU and still live in Dallas, you really need to live in Highland/University Park and make year round recruitment your life's work.
There are women who begin identifying PNM's while girls are still in junior high school. I'm not exaggerating, and I've seen it first hand. Silly stuff, IMO.
SMU is a good school, by the way, if that is at all important...