“Meehdlesex? What ees Meehdlesex?” This is the question I was asked one day at work when I left the book I was reading out on the register. I had taken the plunge to read “Middlesex,” a 500-plus page behemoth, for two reasons. First, I couldn’t possibly read “The Virgin Suicides” one more time. “Suicides” and “Middlesex” are author Jeffrey Eugenides’ only two novels, and the latter had always seemed too daunting. Which brings me to my second reason: HBO is adapting the novel into a miniseries produced by Rita Wilson and writer Donald Magulies.