人類的性活動牽涉到人的不同層面，包括社会層面、心理層面、生理層面、認知層面、行为以及情感層面；例子包括感情紐帶、情感共享、生殖系統的生理機轉，以及性欲。
性愛姿勢做法：對方坐在床上、雙腳打開，背後墊一個枕頭。你坐在他的腰上，腳放在床上。膝蓋彎曲，用手將對方的陰莖(或假陽具)放入你的身體。用腳掌施力將身體抬高或降低，節奏快慢你自己決定。
交往前先踩剎車！先分析「讓你心動的那個人，真的適合你嗎？」再進一步也不遲
長身 紋身 黑肉 貧乳 短髮 熟女 蘿莉 白虎 少女 軟體 巨乳 美腿 美尻 交合
長い波状よく手入れされた髪を持つ若い美しいモデル - 美女 ストックフォトと画像
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.. The widespread, unquestioned equation of penile–vaginal intercourse with sex displays a failure to look at systematically 'whether the respondent's comprehension of the question matches just what the researcher experienced in mind.'
延伸閱讀：做愛時哪種性愛體位最令伴侶投入更易高潮？來試試歡喜佛式女上男下吧！
但释宪后，台湾大法官把“猥亵资讯”分为“硬蕊”（hardcore）和“软蕊”（softcore）；“硬蕊”意旨含有暴力、性虐待或人兽性交等而无“艺术性、医学性或教育性价值”的内容，这是法例明文不允许，但对于“软蕊”资讯，即不含“硬蕊”方面的成人内容，则只需要有适当安全手段加以阻隔，就可以被排除于取缔范围之外。
图像加注文字，圤智雨（中）对于台湾成人影视要如日本般发展，并不是太乐观。
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睡眠高潮如何產生：睡眠高潮是很有趣的一件事，不過卻無法通過人為方式做到的。
Nancy W. Denney; David Quadagno. Human Sexuality. Mosby-12 months Book. 2008: 273. ISBN 0801663741. Although the expression intercourse is usually accustomed to make reference to the insertion of the penis into the vagina, It is additionally accustomed to check with oral intercourse or anal intercourse where the penis is inserted in the mouth or even the anus, respectively.
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