Do Macbook Pros and Airs suffer from the old "one on"?

I'm interested in getting a Macbook Pro or Air, and if I do get one I'll be dual booting OS X and Ubuntu, for which I'd need access to a right mouse on. The touchpads on the Macs look like they only have one physical on, does it right click or will I need to purchase and lug around a USB mouse for Ubuntu?