It is sinful to look upon others nakedness, but not for a husband to look upon his wife's nakedness nor the wife to look upon her husband's nakedness. At Proverbs 5, it says concerning wanting sexual love from a "wayward woman", that to "drink water from your own cistern (or wife) and flowing water from your own well. Should your springs be dispersed outside, your streams of water in the public squares (or a wife go and have sexual relation with another man) ? Let them be for you alone, and not for strangers with you. May your own fountain be blessed, and may you rejoice with the wife of your youth, a loving doe, a graceful mountain goat. Let her breasts (seeing her naked) satisfy you at all times (as in foreplay). May you be captivated by her love constantly. So why, my son, should you be captivated by a wayward woman or embrace the bosom of an immoral woman ?"(Prov 5:15-20)
For example, at Exodus 20, Jehovah God told Moses: "If you make an altar of stones for me, you must not build it using stones cut with tools. For if you do use your chisel on it, you will profane it. And you must not go up by steps to my altar, that your private parts may not be exposed upon it.’(Ex 20:25, 26)
Upon Adam and Eve's rebellion in the garden of Eden, just before Jehovah was about to force them out the garden, Genesis 3:21 says that "Jehovah God made long garments from skins for Adam and for his wife, to clothe them".
Once they ate the fruit from "the tree of knowledge of good and bad " (that established Jehovah's right to set moral boundaries for us as humans, setting a pattern for any future moral laws as our Creator), "then the eyes of both of them were opened, and they realized that they were naked. So they sewed fig leaves together and made loin coverings for themselves."(Gen 3:7)
Until that time, Genesis 2:25 said that "both of them continued to be naked, the man and his wife; yet they were not ashamed." Adam and Eve should not have been ashamed of their mate's body, but Jehovah had apparently built a "mechanism" within the forbidden fruit that would activate upon eating it, sending out a signal that Jehovah's law had been violated, perhaps triggering their conscience.
Nakedness, more so for men than women, triggers a response, and that is why the pornography industry is bigger than all the major sports combined, bringing in an estimated $100 billion each year. That is why Jesus said at Matthew 5: "You heard that it was said: ‘You must not commit adultery.’ But I say to you that everyone (or a man at that time, but now with LGBTQ in vogue, this includes women) who keeps on looking at a woman so as to have a passion for her has already committed adultery with her in his heart. If, now, your right eye is making you stumble, tear it out and throw it away from you. For it is better for you to lose one of your members than for your whole body to be pitched into Ge·henʹna (or everlasting destruction)."(Matt 5:27-29)
The moral boundaries that Jehovah has established is now being "run over", in which "the sky is the limit" when it comes to doing any and everything sexually. However, at Colossians 3, the apostle Paul wrote: "Deaden, therefore, your body members that are on the earth as respects sexual immorality, uncleanness, uncontrolled sexual passion, hurtful desire, and greediness, which is idolatry. On account of those things the wrath of God is coming. That is how you too used to conduct yourselves in your former way of life. But now you must put them all away from you: wrath, anger, badness, abusive speech, and obscene talk out of your mouth. Do not lie to one another. Strip off the old personality with its practices (with its immoral sex), and clothe yourselves with the new personality (that is morally clean), which through accurate knowledge is being made new according to the image of the One (Jehovah God) who created it."(Col 3:5-10)