The result of genetics, simply : Well, no one can choose to have these ack dimples or not to have. It is seen only in people with the genetic predisposition or appropriately sized ligaments.
Good circulation resulting in easier orgasm : Well, these holes on the back are an indication of proper blood circulation in the body and they also help to achieve orgasm easily.
Sign of a healthy body: Apparently, healthy circulation leads to a healthy body. These holes are a sign of healthy living.
Weight loss can help you in having these back dimples : However, no amount of exercise can help you in getting these back dimples. But yes, if you remove excess fat from your body, then these back dimples probably become visible.
Credit : #wittyfeed