Sexy eh? Well let's start with personality. Smart. Funny. Dirty minded. Pays attention. Can hold a decent conversation. Open minded. Similar taste in music.
And of course, to say you don't have physical preferences is a load of bull. While my preferences constantly change, I still HAVE them. For instance, at the moment I prefer a guy to be taller than me, with strong arms, preferably not brown eyes, and a nice bum. Yet, at the same time, my last crush had long brown hair, brown eyes, was scrawny and was my height. Of course, he did have a nice bum. >_> It all depends on progression for me, I guess.