Different CSS if member is woman / man

I want to load a additional css file if a member is a woman. If someone is a man he can load the normal css, but when someone's a woman i want to load some div classes and change the background-color.

How can i do that? 

There are several built in function that might be useful: addCSS, deleteCSS, addJS, deleteJS

I don't think there's any built in functions you could use for gender detection so you'll have to make one. I think someone already did this recently.