Ephesians 5:12
"For it is a shame even to speak of those things which are done of them in secret."
Cross References (ranked by relevance)
But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becometh saints;
In the day when God shall judge the secrets of men by Jesus Christ according to my gospel.
For God shall bring every work into judgment, with every secret thing, whether it be good, or whether it be evil.
Can any hide himself in secret places that I shall not see him? saith the LORD. Do not I fill heaven and earth? saith the LORD.
For thou didst it secretly: but I will do this thing before all Israel, and before the sun.
And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works.
For the time past of our life may suffice us to have wrought the will of the Gentiles, when we walked in lasciviousness, lusts, excess of wine, revellings, banquetings, and abominable idolatries:
Stolen waters are sweet, and bread eaten in secret is pleasant.