The erect stature of humans causes the pelvis to project to the rear of the spinal column, which forces the muscles and fatty tissue of the buttocks into their common configuration. The human buttocks are distinctive among all species in that they are continuously present. The rectum shares a muscular wall with the vagina in females and with the prostate gland in males-both sensitive areas that are particularly stimulated by anal intercourse or stimulation. Anal sex, which often involves the insertion of the penis, finger, or an object into the anus, is a common practice, although it is often considered taboo. The anus, sphincter, and rectum contain numerous nerve endings, making them sites of potential pleasure and pain. The gluteal crease is also the location of the anus, which is both the site of excretion of solid waste matter from the body and an erogenous zone.

Thus, this group can work together or allow independent movement of the legs. This muscle group is significant partly because it is separated into two parts by the gluteal crease (the double hemispheres of the buttocks). In doing so, they provide stability to the core muscles of the trunk, as well as allow for flexibility of the hip muscles and articulated movement of the legs. Their general function is to connect the leg muscles to the trunk of the body. They are among the strongest muscle groups in the human body, comparable in strength to the thigh muscles. The human buttocks are composed of the three gluteal muscles (commonly referred to as the glutes), the gluteus maximus, gluteus minimus, and gluteus medius, as well as the fatty tissue that covers them. They occur in many quadruped species, but are common to primates. Buttocks are fleshy protuberances at the rear of the pelvis.

Cut at top of buttocks