I tend to wear briefs, so when I get hard, it does the curly hardon bit cuz it can't stretch out. I either distract myself so I can let it down, or if I'm wearing something other than briefs than I just let it go wherever it needs to (right pant leg typically) and if I have to stand up (and it would make its presence known), then I reach down my pants and adjust my whole shaft straight up, so that it gets stuck between my stomach and waistband. I've gotten pretty good about doing that discreetly in public.