These are kind of moments I’ve grown to enjoy. You’ll think differently after five years of monogamous marriage—and your wife will really enjoy knowing she can still get it up so easily.
In socially awkward places (like public transportation), just shuffle for your “keys” and align it straight up so the belt holds it in place. You’ve got to be prepared, though, because you’re screwed if it goes down the pant leg. Also, I’ve had it stick out of the top of my shorts or jeans, so you’ve got to have it UNDER your shirt. What an absurd conversation.. But then again, who hasn’t had this “problem”.
In time (and with lots of practice), you can make it soften mentally. It’s taken over six years of meditation, but I can now control almost every physiological process, including slowing or stopping heartbeat and speeding up digestion. Softening an erection is thus child’s play. Don’t think it’s a good to stop your heartbeat around your girlfriend, though; that would be too creepy.
If it helps, think of something work-related or distinctly non-sexy, such as counting prime number 1,2,3,5,7,11,13,.. Or the Fibonacci series. In a fix, I’ve had to think about cooking biscuits in a cast-iron dutch oven. I know, sounds ridiculous, but it really works.