Any anyone tell me exactly WHY it's illegal to be nude in public? Why did that law start? What is the exact reasoning behind the law that people shouldn't show what everyone else already has? I'm looking for serious, NON opinion answers only please.

It's because you can't legislate or make laws governing intent or one's thoughts so they use what they can, laws affecting everyone, trying to label everyone under the umbrella of "Indecent Exposure". They can't prove someone eis trying to deliberately shock someone sexually so they make laws that will help avoid it, they think:-)

For instance, in England, Wales and Northern Ireland, indecent exposure is defined as someone, male or female, exposing their genitals intending another person to see them and to be caused alarm or distress.

In the United States indecent exposure is defined by state law as exposure of the genitals and/or the female breast in a public place and may in some states require evidence of intent to shock, arouse or offend other persons. The act is prohibited by state laws titled variously as Indecent Exposure, Sexual Misconduct, Public Lewdness, and Public Indecency. It is a criminal offense in all fifty states and is punishable by fines and/or imprisonment, and in some states a conviction results in having to register as a sex offender. IN most states they make an exception for breastfeeding, but not all!

It sounds like they are trying to protect children or the easily shocked who look at all nudity as sexual as most societies, even the Greeks, complete nudity has been a sign of incivility and bad breeding. Poor people, primitive people go around without clothes. Sexual deviants go around without clothes. But decent people, people with good breeding, don't.

Disclaimer: The poster doesn't necessarily hold to any of the above though she considers herself a decent human being. If you thought you saw her running around naked through her woods, you are mistaken and unless you have photos to prove it, too bad;-P

It's illegal because everyone thinks it's bad.
After all, if the gods meant us to go about naked, we would have been born without any clothes on.

Because people are prudes. Nudity doesn't hurt anyone other than that a person might not like what they see. But if that's harmful enough for a law then we should have laws against ridiculous fashions. Some people bring up "protecting" children. Protect them from what? Nudity is not inherently sexual. If anything teaching children that nudity is naughty leads people to grow up being overexcited at anything naked. In Europe attitudes towards nudity are a lot more lax, but in America we have more teenage pregnancies. As for decency, you can't quantify or measure decency. It's a concept we invented. We define what is decent and indecent and we can redefine it. It's not like the laws of gravity or the laws of physics. We can change it. There aren't any benefits for society or anyone seeing nudity as indecent therefore that perception should be changed.

American public nudity laws tend to not make allowances for live artistic expression or swimming. Many other countries make direct alowences for nudity. The current U.S. enforcement comes from an omission in the days of outdoor bathing and men swimming pre-trunks. Most places thought it silly to state alowances FOR nudity, thinking it obvious that one would be nude to bathe and swim. Instead only stating what's prohibited. These laws are not the same in each state and sometimes varry between counties.
If you investigate further you'll see that the local laws on nudity stop on federal grounds like national parks and federal reserves. (Though there are places marked non-nude and you'd better obey, it's federal.)
The Florida county that has Cape Canavral includes a federal preserve where nudists go, dispite some city officials wanting it stopped. They've been ordered not to impede access to the land.
Part of the laws against public nudity are due to an assumed ludeness. Another part is an old attempt to enforce modesty. Basicly the old ideas of propriety (being proper) were made into local laws.

There is no federal law prohibiting nudity in public. As far as the various state laws, they are aimed at preventing pornographic nudity. Since it's rather difficult to differentiate between art and porn, some might say they are the same, most states/cities/counties just ban nudity all together.

There is a crime called ,illegal constraint, it means to frustrate people somehow. Being nude in public somehow does frustrates people, maybe not you, but not everybody feels the same.
And that is why it is a crime, by frustrating people it fits on one category of illegal constraint.

Think about not having the law. Anybody would be able to be walking naked if they even felt like it. Would you really want that? Not to mention the erection issue.

I imagine, way back when, the majority ruling groups felt that covering certain body parts would be a good idea. Oviously standard are different in diff countries, i.e. Some African tribe women don't often cover breasts (National Geographic) and some Arabic countries enforce women covering their faces (burkas{sp})....

God never said nudity was a sin. It was after Adam and eve sinned that THEY felt/realized they were naked and FELT ashamed. This is supposedly when God gave them clothes to help THEM feel comfortable.
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In my opinion there's still nothing wrong with being naked if you feel fine with it. Maybe it's just all the people who sin that want us to have clothes......maybe their guilt makes them want to put clothes on everyone.
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If the government is taking the stand that they aren't affiliated with God or his moral code, I really don't see why they have made laws to regulate stuff like this. As`you say everyone has and can see their own equipment, what's the big deal if you see your neighbor has a smaller water hose?

so think that you go nudity all time.........
then you think that was nudity is better to legal or illegal

If you look at most US laws against nudity intent for a reaction is included too. Entertainment, sexuality, salatiousness, shocking others... As you see, the-powers-that-be usually don't want you to get anything out of nudity in public. BUT the state of Ohio decreed that women have the same right as men to be topless, because by their books Breasts are not Reproductive Organs nor an anus. Some cities like Seattle have permitted nude events right in town. However most places either restrict social nudism to distant places of private locations.

Lots of men alive today missed out on nude male swimming at the YMCA, schools and colleges. The removal of the no-cloth policy was a staggered thing through the 50's and 60's. Between financial and gender-political reasons (not to mention the slightly bogus filter issue) it got pushed out.
I searched up these...

http://naturistmusings.blogspot.com/2006/11/memories-of-nude-swimming-at-ymca.html

http://www.topix.com/forum/education/TL1Q54NU3M3RBGI58