There's always a method - or is that a message - behind my madness here. I really appreciate the many responses to my question. The majority, of course, said that they'd never popped a woody and never seen much wood on other guys in communal showers or locker rooms (unless, of course, it was a gay bathhouse). But there's a reason for that.
It's ironic (if that's the correct word) that nervous energy can ensure our cocks don't get hard in front of other people in certain situations, yet at the same time be responsible for some of the hardest, biggest boners we experience during waking hours. Nerves can both prevent a hard-on and cause one. Because there's nervous tension and there's sexual tension (that wonderful sense of nervous anticipation that courses through our bodies) - and, like Magic Wands, our cocks know the difference.
I've seen more than a few semi's, and a few full-on erections, at the local gym; not many, mind you, but a few. One guy stood on a bench in front of the sink mirrors and struck poses to admire his rock-solid, straining hard-on in front of a locker room full of men. He was so proud of his cock that it made me smile in appreciation. But, what really struck me was that nobody went rushing out of the room to complain, nobody scowled, nobody threatened him. And this wasn't a gay spa - this was a standard, neighborhood gym.
I've sprouted my share of semi-hard-on's in communal showers. In school, of course, we were all ashamed of them if they popped up. In the military, we pretty much didn't care. I saw more boners in the military than you could count. Morning wood bouncing and bobbing on the way to the latrine. Semi-wood sprouting as guys showered. And, of course, the room would be filled with them during the circle-jerks we had. And, sometimes, on a Friday or Saturday night one or two guys would be on the couch in the Dayroom watching TV and leisurely jacking off. Once in a while you'd find a guy stroking in the showers. Being horny and sporting a stiff dick was understood as normal.
But, the moral of the post is: Stop worrying about your cock. There are different types and reasons for all the boners we get. Your cock knows what it's doing. If other folks don't understand the physiology of what's behind our zippers perhaps it's time they learned.
Enjoy your Magic Wand and have a boner-ific weekend!