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Whether you know it or not, your testicles are a sperm factory set up to produce sperm throughout your life time. Inside the tubes are sperm nurse cells which manage sperm stem cells. Sounds pretty crowded down there, right?

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A new study shows men in western countries have lower sperm concentration than they did 40 years ago. Infertility affects one in 25 men. One big culprit: low sperm counts.

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What drives the partners of men who have died to try and have their babies? Jenny Morber delves into the legally and ethically fraught world of post-mortem sperm donation. It is late evening, just over an hour after the doctor first groped for his ringing phone.

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In his lab, Pitnick engineers the heads of fruit fly sperm to glow a ghostly red and green so that he can observe them moving through dissected female fly reproductive tracts. He hopes his work will help reveal how sperm behave within female bodies, an area of research that's still in its relative infancy. These kinds of innovations could one day explain the great diversity of sperm shape and size across the animal kingdom. These early sperm scientists found themselves tasked with answering the most basic of questions, for instance: Are sperm living animals?

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Chris - This is a very good question; healthy testes make sperm at the rate of between and sperm cells per second. These collect in a long coil of tubes above and behind each testicle called the epididymis, where they are stored until needed. The testes hang external to the body within the scrotum to achieve an optimal temperature for sperm production.

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One of those is the old-fashioned sperm donation. Fortunately, the Chinese have a solution…. This is exactly what it sounds like: a professional pulsating pussy.

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I'm wondering whether you've just overdone it a bit, especially if you're also having sex with a partner. Did you have the sensations of orgasm, but without ejaculating? Have you experienced this before?

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Photo by Flickr user seeingimonkey. These days, reproductive technology is rapidly changing the way we make babies. There are artificial testiclesartificial wombsand the very creepy possibility of " single parent reproduction " on the horizon. But for now, advances in reproductive technology notwithstanding, you still need the same basic building blocks to create life.

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A lot of men have asked if masturbation lowers sperm count or fertility. A lot of men have asked if frequent masturbation lowers sperm count or their fertility. The quick answer is no.

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