A number of species engage in swarming behavior, where countless individuals move en masse in some direction. But they're not the only ones. Scientists have now found that the sperm of some squid form swarms, and this peculiar behavior could help the cells to fertilize eggs.

This is one of those studies that may mean absolutely nothing. Still, we all want to know about the state of Spanish sperm, and at last a group of researchers has done a longitudinal study to provide an answer. According to a release, the "semen of Spanish men is losing quality," at least in Murcia:

Sperm count is down in French men, according to a study published today in the journal Human Reproduction. The investigation, led by environmental health epidemiologist Joëlle Le Moal, found that the number of sperm in one milliliter of the average 35-year-old's semen declined from roughly 74 million in 1989 to about…

Either this is a very sad looking first generation sexbot, or there's something very seriously wrong in China right now.

Birth control comes in all shapes and sizes, from the incredibly high-tech to the ridiculously simple. So if you're worried about the long-term effects of taking hormones, or tired of taking a daily birth-control pill, there's always another method of birth control that's simple, cheap and effective: the Copper T. The…

Sperm are single-purposed: They're optimized to get to an egg and inseminate it. But that doesn't mean there isn't more to this cell than meets the ovum. Sperm, along with its travelling companion, semen, are surprisingly versatile and adaptable substances. Here are eight unconventional things you can do with human…

Two handfuls of walnuts. That's all it takes. Just two handfuls (around 75 grams/day), and your sperm quality will improve "in terms of concentration, vitality, movement, shape and chromosome abnormalities," according to a study recounted in the latest issue of the journal Biology of Reproduction.

Whether it's lion manes, peacock tails, or narwhal horns, secondary sexual characteristics are generally there to set males apart and, theoretically, make them more impressive to potential mates. For red-spotted newts, there's nothing sexier than thick, oozing kidneys. Yes, really.

You know you've wondered, at least once: What are the benefits of eating sperm? According to the authors of the (self-published) cookbook Natural Harvest, "sperm based recipes" can be delightful. Say the authors:

Mammals generally have evolved the same basic, boring way for males to fertilize an egg: just send a bunch of tiny individual sperm into the female reproductive organs. But in insects like the diving beetle, it gets way more insane.