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Also known simply as "The finger"
This consists of an outstretched arm (although the arm can be bent, or barely outstretched ..
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The full name of the tryptophan synthetase A protein, an enzyme with 267 amino acids, extends to 1,913 letters:
methionylglutaminylargi..
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Masturbating, jerk off, choke the chicken, spank the monkey, beat the meat, whacking the pug, etc. etc.
Manually stimulating your penis..