Why it is ok for Girl to wear boys clothes but deviant behavior for boy to wear girl clothes

6 answers

Social norms in our society, I guess.

Have you noticed the normal clothing for men and for women in places like Afghanistan, China (away from the cities), and other countries besides the US or any other "westernized" countries?

http://www.google.com/search?q=social+norms+determine+dress&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
why do men burp in public (or worse), but girls are not allowed to?

I think we often have gender identity expression ideas that fit into our comfortable zone on social expectations. This is the reason men are the bosses, and women the secretaries, and then we complain about equal opportunity.

Read this http://en.wikipedia.org/wiki/Gender_role
What about the women wearing men clothes.
Did you read the links posted? Read widely, and take notes.
it is alot websites can you provide me one or two specifically
One of the most important skills you can develop is going through an annotated list of websites to find the ones that seem to answer your question.