Since I switched from briefs to boxers 4 years ago, I can't hide the occasional boners that pop up as the outline on the right side of my pants becomes obvious. There have been times that I've been in Home Depot or Costco, seen a hot, athletic guy, and I'll notice junior stirring in my pants. I like feeling a semi growing and pressing against my clothes. If it continues to get all the way hard, I'll stop walking until it calms down or risk causing a scene.