The pair of dimples at the lower back at the starting edge of butt.
These dimples can be in both genders male and female. For females these are called Venus Holes and for males are known as Apollo Holes.
These circles you can find on the lower back where back bone the pelvis. There are no muscles at this point.
No one can choose to have these circles. Only people with appropriately sized ligaments or genetic predisposition naturally have them.
Venus Holes indicate proper blood circulation in lower body which helps to achieve more orgasms.
Good blood circulation also helps body to stay healthy and these circles are a sign of healthy living.
Anyone cannot be get these dimples but when fat people lose their weight with exercise then these circles may be appear if they have them hidden under body fat.