If I answered that question honestly, it would say something like this, "I'm looking for and impossibly gorgeous creature with near nymphomaniac tendencies that has the sex drive of an alley cat and the stamina of a Kenyan marathon runner. And if you like to cook and have a great job making six figures, I will love you the rest of my days-like-for real. I'm looking for someone that wants to let me make all my dreams come true."
But that's scary and somewhat disingenuous. I don't ever say, "Just like my dead spouse." either. Tends to scare them away. So I wind up going with, "Someone that wants to seek out a life and a love uniquely it's own, whose heart and mind can grow and learn with mine.....and no one with needy 20 something criminal rat-bastard kids still at home."