There have been studies done that control for the variables of both confidence and status that show that women are sexually attracted to buff bodies.

It isn’t merely that working out makes you confident, and women dig confidence. No, studies have irrefutably proven that a buff body is a distinct parameter that raises attraction.

There have long been weak minded memes floating around that all attractive traits reduce down in essence to nothing other than confidence. Science has killed the logic those memes relied on. It is time for those memes to die. There are a variety of attractive traits – confidence is one of them.

Rollo’s article Looks Count links to the full study mentioned.