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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I wear small(er) pants, so it kind of awkwardly presses itself downward and holds it in one spot so it ain't goin' free willy and gettin' excited.