Breasts are most prominently located in the upper torso area on the body on most mammals including humans. For both male and female humans, the three main parts of the breasts are the breast itself, the areola and the nipple. Both male and female breast development comes from the same embryological tissue, but during puberty, the female breast increases in size, due to the increase of the hormone estrogen.http://medicalcenter.osu.edu/patientcare/healthcare_services/breast_health/normal_breast_development/pages/index.aspx

Due to this size increase, the focus on the female breast has been prevalent to that of the male breast and has led to visual appreciation of this body part in the public's view. Modeling, adult films, sporting events and photography all have played a role in increasing the focus on the female breast.http://www.medicinenet.com/breast_biopsy/article.htm

Breast augmentation, also known as breast implants, most often made from silicon or saline, are surgically placed either below or above the breast muscle to enhance the look and/or increase the size of the breast. This is most common with adult film actresses, who have found the fascination and allure of the female breast can increase their notoriety as well as audience interest.

Just as breast augmentation is available to increase the size of breasts, reduction surgery is preformed in order to decrease the size and weight of the breast. Some reductions take place in order to relieve strain on the back due to breast weight, while other reductions occur as the result of leaking implants or other problems with previously administered implants.http://www.implantinfo.com/