How to Find Male Or Female In Your Friends List

Here i found something new,if you want to see how many girls are there in anybody's friends list than here is the simple way:
Just open victim's friends list now look at the addressbar >> u can see his/her user id ....now just add this after it >>> &q=female. Now see wat u got ....well u can also see how many male are there ....but m sure u'll write female....