It's nice when someone goes from passive aggressive to just being straight up rude, closed minded and snobby.  Easier for casual readers to figure out, don't cha know.
I'm sure there are members of EVERY sorority who have tattoos in general (from small to large) and who, believe it or not, are in national leadership roles.  My answer was regarding tats period, not those with letters - everyone has their own rules about those.  Honestly, tattoos aren't "shocking" anymore.  This whole discussion reads like a missive from a 1971 fraternity magazine about the evils of sideburns.
But yeah, be careful with ANY large pieces...lower back or anywhere.  
http://www.youtube.com/watch?v=phN6tF5WJKM