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"I'm not sure this system is still in play. Long before the days of Grindr, the bandanna was a sexual signal only in the back pocket of jeans, and the significance varied based on both color and which pocket it was in. The color indicated preferences for different sexual favors, scatologies, etc. The left pocket referred to a preference for a dominant role in that fetish, the right a submissive one. Refreshing myself on the code with an online chart, I realized that although I have a very nice brown-and-pink pocket hankie, I wear my hankies in my jackets, not my jeans. And if I'm wearing a yellow pocket hankie and somebody at the next urinal pees on my shoes, I'm back to white linen hankies."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.gq.com/story/do-pocket-squares-signal-sexual-fetishes-in-gay-culture>