Some people have these small circles on their lower back. these circles can be formed in both men and women, and are known as Apollo holes, or Venus holes, respectively.
These holes are positioned on the spot where two bones connect the pelvis and can only be noticed in people who have genetic predispositions for this or appropriate size ligaments. One cannot choose to have them or not, as genetics is the main and the only factor here.
If one has these holes on their lower back, it means that they have good circulation and a healthy body. A good circulation is a predisposition for experiencing orgasm more easily.
These Venus holes are positioned in a place with no muscles, so there is no way for one to create them by doing exercises. However, if you get rid of the excess fat, the holes can become visible for one who has them, but is not able to see them because of the extra fat on their body.