tug muscle:

The penis , possibly alluding to masturbation . See penis for synonyms.
See Also: abdominal wall, anal sphincter, bottle dance, colpismus, corpuscle, cremaster, cremaster muscle, danse du ventre, gluteus, gonk, musckles, PC muscle, pubococcygeal muscle, pubococcygeous muscle, pubococcygeus, rubber flexes, tug-o-war with the cyclops, tunica dartos

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