If I'm wearing shorts, I lift the right leg of my shorts and boxers and pee.

If I'm wearing trackpants or sweatpants, I'll pull the waistbands of the pants and boxers down. This may or may not expose the balls - I don't think about it too much; I just go.

If I'm wearing jeans or slacks, I unzip the zipper, bring the penis out through the fly in my boxers, and let it rip.