Female is the plug with the hole, refering to it as the vagina, you plug the male connecter (the one the sticks out like a penis) into it.
Seriously though, the male connecter looks like the end of a usb mouse or keyboard (or any other usb device). The female connecter is the usb plug that you'd find on the pc mobo. You will most likely never find a usb male plug not part of a device or extension cable, and pretty much never find a female plug that isn't an addon to a pc mobo, or are the 4 slots of a usb hub
I went to my local microcenter and got a usb hub that plugs into the back of my PC. Costed like 7 dollars (there were 4 plugs). Although, I have to do alot of cutting because it was coverend in a rubber, i mean rubber.