In the Smalleville TV series, we have the continual mystery about "Clark's secret". Lana, Chloe, and Lex Luthor are all chomping at the bit to find out what it is...
Wouldn't it be funny if it turned out Clark's secret was crossdressing?
He didn't want to tell Lana about his secret for fear that she wouldn't accept him. He was trying to protect her from the social stigma.
Meanwhile, Lex Luthor has secrets of his own. He intends to use his vast capital to build a machine to turn himself into a biological female.
Finally, when Clark unveils his secrets, he finds he has many women to help him with his crossdressing:
Lana Lang - A classy, upscale Paris style fashion
Chloe Sullivan - Stylish yet not too classy.
Lois Lane - The rebellious styles
Kara (Clark's Kryptonian cousin) - All of the secret Kryptonian styles