Because I'm nobody's Spanderista. Why would you dump an abbreviation that spells sex, for a word that sounds like limp lycra?
(Also because I have a sense of humor, straight-leg levis, peanuts in my Coke, and bushels of brilliant S/B writers flocking to my OTP. Life don't get much better, y'all.)
Edit: Do bushels flock? Do I care? It's 1:30 in the freakin' a.m.!