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To answer your question, YES. you have what you call an 'external anal sphincter' which does the twitching. During rectal exams for neurologic disorders, doctors asks their patient to squeeze while they insert a lubricated and gloved finger, a tightening on the examining finger means you have a positive 'anal wink' test. This test is most commonly used to determine if you have damage on your spine (positive anal wink test means normal), specifically your S4 and S5 spinal segments.
do assholes actually twitch?