I'm a 34 year old male. How often should I get a physical exam by my doctor?

Annually. The exam part of an annual physical is usually not the most important part, unless you're having symptoms. However, it is important to get your blood pressure checked annually. The remainder of the "physical exam" is geared to identifying risk factors for things like diabetes or cancer, doing appropriate screening tests, and discussing how to get and stay healthy with your doctor.