Of the approximately 1 in 10 couples who are infertile, it has been estimated that male factors alone contribute to 30% of these cases. When it comes to conceiving a child, there are lots of things that can go wrong - sperm allergies, poor egg quality or ineffective sperm.

Though men produce millions of sperm a day (compared to the 300–400 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.

Do not underestimate the effect your lifestyle can have on the quality of your sperm and read below some more or less surprising factors that may affect the process of a man's spermatogenesis.

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Trying to Get Pregnant? 10 Proven Sperm Killers

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