flex one's sex:

Of a male, to masturbate . See masturbation-male for synonyms.
See Also: 50:50, belly woman, bit of ebony, bit of goods, bit of skirt, bitch-queen, blue handkerchief, break in the balls, charcoal blossom, charcoal lily, chocolate drop, club date, cut him off, deft-and-dumb, deuterition, drive-thru, dusky dame, fifty-fifty, gutter limits, hunk of beef, main hole, morning hard-on, oncer, raven beauty, ride, saddle, sex bunny, sex-linked, sextacy, sugar brown, two-way girl, upside-down kiss, yumph

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