To someone who has traveled the world, the answer should be simple: It is not "natural"--or innate--to be afraid to show yourself naked. Modesty--or the lack of it--is first and foremost a matter of social convention.
As you can imagine, the wandering Sophists created bitter wrangling in Athens by pointing out that there were no absolute norms for what was right or wrong.
Socrates, on the other hand, tried to show that some such norms are in fact absolute and universally valid.
Who Was Socrates?
Socrates (470-399 B.C.) is possibly the most enigmatic figure in the entire history of philosophy. He never wrote a single line. Yet he is one of the philosophers who has had the greatest influence on European thought, not least because of the dramatic manner of his death.
We know he was born in Athens, and that he spent most of his life in the city squares and marketplaces talking with the people he met there. "The trees in the countryside can teach me nothing," he said. He could also stand lost in thought for hours on end.
Even during his lifetime he was considered somewhat enigmatic, and fairly soon after his death he was held to be the founder of any number of different philosophical schools of thought. The very fact that he was so enigmatic and ambiguous made it possible for widely differing schools of thought to claim him as their own.
We know for a certainty that he was extremely ugly. He was potbellied, and had bulging eyes and a snub nose. But inside he was said to be "perfectly delightful." It was also said of him that "You can seek him in the present, you can seek him in the past, but you will never find his equal." Nevertheless he was sentenced to death for his philosophical activities.
The life of Socrates is mainly known to us through the writings of Plato, who was one of his pupils and who became one of the greatest philosophers of all time. Plato wrote a number of Dialogues, or dramatized discussions on philosophy, in which he uses Socrates as his principal character and mouthpiece.
Since Plato is putting his own philosophy in Socrates' mouth, we cannot be sure that the words he speaks in the dialogues were ever actually uttered by him. So it is no easy matter to distinguish between the teachings of Socrates and the philosophy of Plato. Exactly the same problem applies to many other historical persons who left no written accounts. The classic example, of course, is Jesus. We cannot be certain that the "historical" Jesus actually spoke the words that Matthew or Luke ascribed to him. Similarly, what the "historical" Socrates actually said will always be shrouded in mystery.
But who Socrates "really" was is relatively unimportant. It is Plato's portrait of Socrates that has inspired thinkers in the Western world for nearly 2,500 years.
The Art of Discourse
The essential nature of Socrates' art lay in the fact that he did not appear to want to instruct people. On the contrary he gave the impression of one desiring to learn from those he spoke with. So instead of lecturing like a traditional schoolmaster, he discussed.
Obviously he would not have become a famous philosopher had he confined himself purely to listening to others. Nor would he have been sentenced to death. But he just asked questions, especially to begin a conversation, as if he knew nothing. In the course of the discussion he would generally get his opponents to recognize the weakness of their arguments, and, forced into a corner, they would finally be obliged to realize what was right and what was wrong.
Socrates, whose mother was a midwife, used to say that his art was like the art of the midwife. She does not herself give birth to the child, but she is there to help during its delivery. Similarly, Socrates saw his task as helping people to "give birth" to the correct insight, since real understanding must come from within. It cannot be imparted by someone else. And only the understanding that comes from within can lead to true insight.
Let me put it more precisely: The ability to give birth is a natural characteristic. In the same way, everybody can grasp philosophical truths if they just use their innate reason. Using your innate reason means reaching down inside yourself and using what is there.
By playing ignorant, Socrates forced the people he met to use their common sense. Socrates could feign ignorance--or pretend to be dumber than he was. We call this Socratic irony. This enabled him to continually expose the weaknesses in people's thinking. He was not averse to doing this in the middle of the city square. If you met Socrates, you thus might end up being made a fool of publicly.
So it is not surprising that, as time went by, people found him increasingly exasperating, especially people who had status in the community. "Athens is like a sluggish horse," he is reputed to have said, "and I am the gadfly trying to sting it into life."
(What do we do with gadflies, Sophie?