早洩(premature ejaculation)是男性常見卻難以啟齒的性功能障礙之一,它的特色是難以控制射精,當陰莖預備進入陰道前或剛進入陰道便已射精。早洩根據發生的型態,可以粗略分成兩種;原發性(lifelong)的早洩和次發性(acquired)的早洩。原發性的的早洩是指男性第一次性經驗開始,就有早洩問題;而次發性早洩是指原本沒有早洩的問題,之後在某個時間開始有了早洩問題。早洩的定義很多,醫學上目前主要採用的有兩種,一是由國際性醫學學會(The International Society for Sexual Medicine)提出的定義,二是精神疾病診斷及統計手冊(Diagnostic and Statistical Manual of Mental Disorders)裡的定義。其中國際性醫學學會的定義,須包含以下三種面向的組合:第一,陰莖進入陰道前或進入陰道後一分鐘內即達到射精(原發性早洩)或是陰莖進入陰道後三分鐘以內即達到射精(次發性早洩);第二,無法自主控制射精;第三,因為上述的射精障礙,而有緊張、壓力、沮喪、拒絕發生性關係與親密行為等負面的個人影響。而精神疾病診斷及統計手冊的定義是男性持續或反覆出現在進入對方陰道一分鐘內,僅受到輕微刺激,即發生無法控制的提早射精,症狀持續超過半年且大部分性生活時都會發生,此症狀造成個人明顯壓力,但需排除精神疾病、藥物或伴侶關係所導致。
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