Here are 4 Bible verses about private parts from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
Exodus 28:42 KJV
And thou shalt make them linen breeches to cover their nakedness; from the loins even unto the thighs they shall reach:
Genesis 9:22 KJV
And Ham, the father of Canaan, saw the nakedness of his father, and told his two brethren without.
Ezekiel 16:36 KJV
Thus saith the Lord GOD; Because thy filthiness was poured out, and thy nakedness discovered through thy whoredoms with thy lovers, and with all the idols of thy abominations, and by the blood of thy children, which thou didst give unto them;
Exodus 20:26 KJV
Neither shalt thou go up by steps unto mine altar, that thy nakedness be not discovered thereon.