This is not true. It would be true if sperm dribbled out the penis, but it's called ejaculate for a reason. The semen gets shot into the vagina, giving an equal chance for either sex. If their are four or more of one gender than the other in a family, it's because the missing gender (chromosome) is not forming correctly. It's not hereditary, just a fluke of nature, that's why you never see many generations of mostly males or females.
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