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Anilingus

(Latin of anus – an anus + lingo – to lick an anilingus) – one of types of preliminary caress in a prelude to a coitus at which the sexual satisfaction is reached irritation of anal area of the partner lips and language.

 
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Was considered earlier that yawning enriches an organism with oxygen. However this opinion was disproved. Scientists proved that yawning, the person cools a brain and improves its working capacity.