Study: Sex exists because of parasites

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Here's a weird bit of biology. A new study suggests that parasites might be responsible for the existence of sex as we know it. According to, biologists at Indiana University have determined that:

"Although sexual reproduction between two individuals is costly from an evolutionary perspective, it is favored over self-fertilization in the presence of co-evolving parasites. Sex allows parents to produce offspring that are more resistant to the parasites, while self-fertilization dooms populations to extinction at the hands of their biological enemies."

Basically, that's a long-winded way of saying that we have a little worm called Caenorhabditis to thank for all our sexual exploits. Otherwise we'd be doomed to a sexless existence (and an all-female species).This is a rare occasion when we can actually attribute a parasite for making our lives a lot more fun.