People draw nude art all the time
they have since the beginning
of art. It isn't sick or whatever.
In some cases it is inappropriate
but the portrait you commented
on was not bad. Are you in
middle school or something?
I'm not trying to be a jerk but
you seem young, at least
judging by your comment.

Um...of course you don't see a lot people on the street nude...there's a difference in artistic nude and um...public nudity. If you go somewhere where art is posted, you should realize that people are going to make that kind of art. It tells you to view at your own risk because you may be subject to art that has not yet been flagged.