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The monozygotic twin half-sib method for analysing maternal effects and sex-linkage in humans. Two-thirds of all twin births result in same sex fraternal twins and one-third are different sex fraternal twins. Sex Snobs w/ Lung Letters, Twin Bitches, Endless Youth in Austin.
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The blade pulled the skin and flesh around itself as it sunk slowly into her bowels. For most psychological, physiological, and medical variables there are substantial age and sex effects.