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An aphrodisiac is a substance that, when consumed, increases sexual desire.〔(Definition at thefreedictionary.com )〕 Aphrodisiacs are distinct from substances that address fertility issues such as impotence or secondary sexual (dys)function such as erectile dysfunction (ED). The name comes from the Greek ἀφροδισιακόν, ''aphrodisiakon'', i.e. "sexual, aphrodisiac", from ''aphrodisios'', i.e. "pertaining to Aphrodite",〔.〕〔(【引用サイトリンク】url=http://www.etymonline.com/index.php?term=aphrodisiac&allowed_in_frame=0 )〕 the Greek goddess of love. ==Assessment of aphrodisiac qualities== Throughout history, many foods, drinks, and behaviors have had a reputation for making sex more attainable and/or pleasurable. However, from a historical and scientific standpoint, the alleged results may have been mainly due to mere belief by their users that they would be effective (placebo effect). Likewise it is noteworthy that many medicines are reported to ''affect'' libido in an inconsistent or idiopathic ways: enhancing or diminishing overall sexual desire depending on the situation of subject. This further complicates the assessment process. For example, Bupropion (Wellbutrin) is known as an antidepressant that can counteract other co-prescribed antidepressants' libido-diminishing effects. However, because Wellbutrin only increases the libido in the special case that it is already impaired by related medications, it is not generally classed as an aphrodisiac. Classically, to be considered an aphrodisiac, a substance should: * Be administered orally * Reliably increase libido or sexual desire (no placebo effect, no diminishment of libido) * Take effect in a relatively immediate time frame (minutes or hours, not days or weeks) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「aphrodisiac」の詳細全文を読む スポンサード リンク
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