Why are your butt cheeks so big?

Answer 1

The gluteus maximus is the largest of the gluteal muscles and one of the strongest muscles in the human body. It starts at the top of the buttock and actually stretches down and around to the front of the thigh area just above the knees. There are areas where fat will deposit because this muscle has to be protected from external damage as well i.e. falling back on to the buttock.

Answer 2

Well if you have ever heard the saying "the more the cushion the better the pushing" boy like big butts because they feel good and when you have sex it feels better also.