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Comparing Gorillas and Chimpanzees Proves Quick Test: Who has the biggest penis? Comparing gorillas and chimpanzees proves that women prefer bigger penises! Yes, you read it right.
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Semen Collection from Stallions

By Erica Kain When it comes to conceiving a child, there are lots of things that can go wrong—sperm allergies, poor egg quality, and ineffective sperm. Though men produce millions of sperm a day compared to the — eggs that women release during their lifetime , external factors like temperature can affect the health of these little swimmers. And because sperm cells take about 75 days to grow to maturity, harming them can affect your fertility. Human testes cannot function properly unless they are able to stay cooler than the rest of the body. Thankfully, the male anatomy is designed to create distance between the testes and the core body temperature.
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Is This New Penis Spray to Treat Premature Ejaculation Safe for Your Vagina?

Can drinking Mountain Dew be a sperm killer? What about using a laptop? Get the truth about what really affects your fertility. For men who want children , sperm count and sperm quality are important.
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A spermatozoon joins an ovum to form a zygote. A zygote is a single cell, with a complete set of chromosomes , that normally develops into an embryo. Sperm cells contribute approximately half of the nuclear genetic information to the diploid offspring excluding, in most cases, mitochondrial DNA. In mammals, the sex of the offspring is determined by the sperm cell: a spermatozoon bearing an X chromosome will lead to a female XX offspring, while one bearing a Y chromosome will lead to a male XY offspring. Sperm cells were first observed in Antonie van Leeuwenhoek 's laboratory in
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