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Perhaps one of the more unpleasant historic examples of an aphrodisiac is Ambra grisea, a solid waxy substance produced in the stomachs of sperm whales. It was considered an aphrodisiac in many Arabic countries, where it was stirred into a cup of sweetened tea. Disgusting as it may sound, there is some truth in this belief, as Ambra grisea contains chemicals that have been linked to an increased concentration of sex hormones.