1 Corinthians 12:21-23

The eye cannot say to the hand, “I have no need of you,” nor again the head to the feet, “I have no need of you.” But quite the contrary, the parts of the body that seem to be weaker are [absolutely] necessary; and as for those parts of the body which we consider less honorable, these we treat with greater honor; and our less presentable parts are treated with greater modesty