ets say you take a bite of a crispy cracker and lets say you had headphones on and the sound sent to your ears was an artificially generated sound that's mushy instead of crispy crunch. It's been discovered that you'll claim the cracker didn't taste as good even though it was a cripsy cracker. Taste buds alone do not recreate the whole phenomenon/sensation of taste. It's always a combination of the senses.
So it stands to reason that a women that can trigger almost all my senses simultaneously would be a big turn on. It wouldn't be possible for a girl to pull that off just by one single trait: the scent of her perfume, or a high IQ or what have you. It's the total package and the right mix that does the trick: Chemistry, personality, goals in life, view about certain things, her character, etc... good looks would play a big factor but this too would be a combination of healthy looking skin, choice of clothing, body shape, proportions, etc.
Having that said, I'm most turned on by good looks, and to a lessor extent, performance when I see escorts because those are the primary two things that matter during a session. As long as she isn't a bitch, those are the main two things. In terms of looks: Long legs, athletic or relatively thin thighs, butt shape, tight abs, pretty face, preferably long hair. Good hygiene is obviously a must cuz I always shower before the session starts and I expect the girl to be absolutely clean as well. Boobs don't matter to be at all though. Couldn't care less if they are A cup or D cup... as long as they aren't too big. Personality would matter if it's a very long session but I'm not looking for a GF, just someone fun in the sack