.. The widespread, unquestioned equation of penile–vaginal intercourse with sex demonstrates a failure to examine systematically 'whether the respondent's knowledge of the concern matches exactly what the researcher experienced in your mind.'
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In lots of cultures worldwide, vaginal sex is exactly what is normally implied when individuals make reference to 'possessing intercourse' or 'sexual intercourse'. It is the most often researched actions and is commonly the main focus of sexuality education programming for youth.
出演过色情电影的主流演员列表（英语：List of mainstream actors who have appeared in pornographic films）
「文里補習班」開課啦！這次要做出茶水間就能輕鬆烹煮的「馬克杯蛋包鮪魚起士飯」
性慾同時牽涉了心理學與生理學。在心理學中，性慾被認為與食慾類似，是性行為的驅動力。只要沒有經歷性滿足，「性慾」就會積累，而人對性活動的渴望就會加劇。
为什么台湾的成人片产业在近年越趋蓬勃？业界人士认为，除了因为社交媒体、网路科技的发展，以及年轻世代对性的态度更为开放，另一关键因素是台湾法律的松绑。
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台灣約炮達人約炮害羞的白滑妹妹 插入淫穴嬌嗲呻吟被內射後不停叫不要射裡面
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As an example, Unless of course a lady is penetrated by a man's penis she remains technically a virgin although she has had plenty of sexual knowledge.
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C點高潮指的是子宮頸和子宮周圍神經末梢受刺激出現的快感。換句話說，如果妳切除了子宮，會影響妳獲得子宮頸高潮、性伴侶陰莖的大小（若妳的性伴侶為異性）也會影響妳子宮頸高潮的體驗。過度用力的衝刺可能會導致妳受傷，因此在發生性行為前要做好充分溝通。