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Most likely because of the pressure that compressed gas would exert on their surroundings, such as if one was on a chair, the pressure would generate a sound as it pushes the fart onto the solid surface that is louder than what one might want whereas when one lifts the butt, the fart dissipates and does not cause any excess sound from reverberation with the chair. Plus it keeps the smell of the fart from concentrating

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13y ago

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