1 Corinthians 12:22-24

In fact, some parts of the body that seem weakest and least important are actually the most necessary. And the parts we regard as less honorable are those we clothe with the greatest care. So we carefully protect those parts that should not be seen, while the more honorable parts do not require this special care. So God has put the body together such that extra honor and care are given to those parts that have less dignity.