I watched a special on the Discovery channel that tried to answer this same question. Men want a small waist with wide hips, symmetry, a high pitched voice...Uhh..I can't remember much else, but those are a few things that men like universally.
You forgot big eyes. Holy god, big eyes take the strength from my knees.
Basically, they (sub)consciously look for markers of high estrogen levels. Good fertility means many good babies. Instinct likes many good babies.
OP, lemme make it simple, instead of a list. Look as much like Amanda Seyfried as you can. Gay men want to make babies with her.