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女人呻吟是高潮效应的应答表观
在做爱的过程中，有的女性常常会发出程度不同的呻吟或叫喊声。医学研究证实：做爱过程中发出这种呻吟声，完全是因为性高潮来临时产生的性快感所致，是一种自然外露的生理反映。
女性做爱接近或达到性高潮时，随着肌肉敏感性增加，肌张力增强，常发生不自主的抽搐或抖动
(多见于会阴部周围的肌群呈节律性收缩)，血液中的含氧量会减少，二氧化碳相对增加，唿吸必然加快。
这时候，女性便会因为陷入轻微的缺氧状态而呈现出眼睛失神、视线模煳、身体轻度痉挛等系列所谓“性高潮症状”，自然发出特有的呻吟。同时，喉头肌肉会产生痉挛而不由自主地加大唿吸幅度，空气出入痉孪的喉头声带时，也会发出“呻吟”声。
另一方面，临近性高潮时，女性大脑中的“兴奋物质”会随之增加，尽管目前人们对这种物质的认识仍然十分有限，但已经知道“它能使人的意识模煳，会冲淡女性的理智，发出连自己都难以想象的叫声，有的女性事后对此竟然一无所知。”
一般来说，做爱时女性发出的这种呻吟声，是性快感及高潮效应的一种应答表观，决不是什么痛苦难受的象征。性快感及高潮愈强的人，这种表现愈明显。当然，这并非是每个女性都有的表现，不能据此作为性快感与高潮出现的惟一标志。夫妻双方应相互经常交流体会，了解对方性快感表现的类型，使性生活更加和谐美满。
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