Below the waist, on left and right, are the hips. Between the hips are the reproductive organs, the penis (male) or the vagina (female). At the back of the lower body are the buttocks for sitting on. They are also commonly referred to as the rear end or the bum (especially with children). The internal organs in the lower body include the intestines for digesting food, the bladder for holding liquid waste, as well as the liver and the kidneys. This area also contains the woman's uterus, which holds a baby when a woman is pregnant.