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The domestic pig (also swine, in some areas hog)is considered a subspecies of the wild boar but was domesticated as early as 13,000 BC in the Tigris River basin.A male pig is called a boar, and his penis is curled like a corkscrew. A female pig is called a sow. When climaxing, her orgasm can last 30 minutes. The retractions of her inner genitals helps the sperm find her eggs faster.