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据说憋精有理于生男孩, 也就是说算准排卵期两周一次. 因为染色体XX为女, XY为男. 当男人精子在体内时间过长, 染色体X会减少, 因次XY结合几率大. 信不信由你.

stevenlu (抛砖引玉)
(#2720@30)
2006-8-18 -04:00
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