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Low levels of testosterone, the male sex hormone, may be responsible for infertility in some men.

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The effect of sperm selection on females was more variable.

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Plenty of exercise - though not to exhaustion - and not too much junk food will help.

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In a man's sperm sample something like 30 to 70 percent of our sperm cells are motile that is, they move with purpose.

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Sperm like it cold One more interesting fact about spermatogenesis is that sperm cells prefer a cool environment.

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Lifestyle factors and reproductive health:

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Most men suffer at least a few episodes of erection failure during their lives.

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The 'tail' of the human sperm is predictably used to propel them through liquids, the 'head' contains small energy factories called mitochondria, in addition to the cell's DNA - packaged into twenty three chromosomes.

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These technologies often skip several, if not all, possible steps of selection before fertilisation.

Cigarette smoking and semen quality:

An essential function of healthy sperm cells is their ability to swim.

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