The head of the penis is a very sensitive area... so how do you walk around all day with it rubbing against your underwear (or trousers, you brave soul[s]) and not get turned on, if not completely numbed by the sensation after, I dunno, several hours?
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It's actually the bottom of the head, that's where the penis is most sensitive. But you're right, sometimes getting drift wood happens a little too easily, but you learn a couple tricks, and besides, I'm so busy these days, I probably don't think about sex for days on end before I remember "oh shit I forgot how much fun it is," and then I all of a sudden have more work.