Bone Structure. The pelvis is the part of your skeleton which forms the shape of your hips and basis for your buttocks. This is one part of your butt that you cannot change. Females typically have a wider pelvis than males to allow for childbirth and this causes the femur or thigh bones to also be positioned wider.

There are many muscles in the buttocks region, but the main ones that contribute to the shape of the buttocks are; Gluteus Maximus (Yellow), Gluteus Medius (Blue) and Gluteus Minimus (Red) are the main muscles that contribute to the shape of the buttocks.

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