Blame parasites for sex

See:

http://io9.com/5818015/sex-evolved-to-prevent-parasite-infections?tag=science

Article reads: Sexual reproduction that involves two partners is far less efficient than self-fertilization — at least, from the perspective of evolution. So why did creatures like humans ever start having sex with each other? According to a new study, we did it to fight parasites. We spoke with the researchers to discover what this says about sex.

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