Personally I can think of nothing sexier than curvy deltoids (shoulders) on a woman.
Well... perhaps a nice back-side...but shoulders run a close second.

Not "large" shoulders... just ones that have a bit of muscle and a nice sweep.
And there's no doubt that women love broad-shouldered men.

But did you know the REAR deltoid is just as responsible for the look of curvy, broad
shoulders as the part most people work: The medial deltoid?

The deltoid is three muscles: Anterior (front), Medial (side) and Posterior (rear.)

Work your rear delts by using a cable pulley set as high as it will go. Use about half your bodyweight as a starting point. Use a medium-length straight bar on the
cable machine. Grip the bar overhand, flair your elbows out to the side and keep your
arms parallel (or slightly elevated) with the floor. With your chest out, put your
dominant foot up on the cable machine for support (as if you were going to kick it
over) and then pull the bar to your upper chest. This activates the rear delts. Do
this right and you'll add more curve to your delts in no-time.