Huh?
If you have a Mighty Mouse, you can right-click.
What kind of Mac do you have? A desktop or a laptop?
For both desktops and laptops:
-You can plug in a Mighty Mouse, then turn on the right click in System Preferences.
-You can plug in a multi-button mouse other than Mighty Mouse, and the right click should work right away.
-And yes, as a last resort, you can hold Control and click.
For laptops only:
-You can turn on "Tap trackpad using two fingers for secondary click" to enable the right click using the Trackpad.