Sexual ornaments are seen in many organisms; in humans, females have sexual ornamentation in the form of breasts and buttocks. The physical attraction to sexual ornaments is associated with gynoid fat, as opposed to android fat, which is considered unattractive. In human females, proximate causes of the development of sexual ornaments are associated with the predominance of estrogen in puberty. The activation of estrogen receptors around the female skeletal tissue causes gynoid fat to be deposited in the breasts, buttocks, hips and thighs, producing an overall typical female body shape. Specifically, female breasts are considered more attractive when symmetrical, rather than asymmetrical, as this is thought to reflect good developmental stability.
