CATHY WROTE: Was feeling very formerly during my recent extended stay in Europe.Ã‚Â A dozen years ago when I first traveled there solo, hot guys practically dropped from the sky to squire me around town. I have an entire photo album filled with shots of me with handsome strangers–Nigel, Etienne, Jan, Mario–all looking pleased to be in my youthful company. Now, apparently, I am invisible. Other than a shady, middle-aged Turk who followed me for several blocks on the streets of Stuttgart, I commanded no notice whatsoever. Are European men equipped with supersonic young-American-female-tourist radar?