There is a common myth that anal sex can lead to an increase in the size of the buttocks. However, anal sex itself does not cause any permanent changes in the size or shape of the butt. The size of the buttocks is primarily determined by genetics, body fat distribution, and muscle tone.
That said, temporary changes can occur due to increased blood flow and muscle relaxation during and after anal sex, but these effects are not permanent. If you're looking to enhance the shape or size of your buttocks, exercises that target the glute muscles or other forms of body conditioning might be more effective. Always prioritize safety and comfort in any sexual activity.