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FX stands for Faecal Exchange. To instigate an FX trade first you must loosen your stool with an oily emulsion. Next, part your bum cheeks and press your anus against the anus of your partner. The final step is to poo forcefully into the anus of your partner. On a molecular level, the streams of poop battle eachother in a Voldemort and Harry Potter style stand off. The partner who has invested the most poo is triumphant and everyone goes home happy
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