holes are called Venus, it is small circles formed in the lower back in men and women. In the case of men, then these holes are called holes Apollo.
They are located in a place where two bones of the pelvis are connected, and can only be seen in people with this genetic predisposition or ligaments appropriate size. We can not choose whether or not we, because is simple genetics.
They are a sign of good circulation and a healthy body and a large circulation is an important easier to achieve orgasm prerequisite.
From Venus holes are located in a place where no muscle, it is impossible to create them with some exercises, but if you work for the removal of excess fat, these holes may be visible.