stretching the muscle:

Male masturbation . See masturbation-male for synonyms.
See Also: abdominal wall, anal sphincter, bottle dance, catatasis, colpismus, corpuscle, cremaster, cremaster muscle, cremasteric muscle, danse du ventre, dartos, dartos muscle, extreme cunt torture, gluteus, Leather Lane, levator vaginae, musckles, PC muscle, pubococcygeal muscle, pubococcygeous muscle, pubococcygeus, rubber flexes, tunica dartos, virgin membrane, virginal membrane

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