.. The prevalent, unquestioned equation of penile–vaginal intercourse with sexual intercourse displays a failure to examine systematically 'if the respondent's comprehension of the concern matches what the researcher had in mind.' 

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性愛姿勢做法：對方坐在椅子上(或是床邊)，兩人面對面，你坐在他的大腿上。

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做法：單腳面向伴侶站立，另一條腿環繞對方的腰，他抓住你的腿並支撐你。

性教育ユーチューバー・助産師 シオリーヌさん　大人にこそ知ってほしい「性」のこと

肌膚高潮如何產生：研究顯示，肌膚高潮通常由音樂引起，不過電影愉快的畫面、動人的藝術作品或讓妳產生特殊感覺的人待在一起，也會出現高潮現象。肌膚高潮比起其他形式的高潮，更無可預料。

遗传学。注意缺陷多动障碍可能在家族中遗传，研究显示也可能与基因有关。

The very first working day of the couple dwelling together in the domestic AV plot, the fornicating sexual intercourse daily life 21 min

性愛姿勢做法：這是狗趴式的變化版。對方四肢著地趴下、臀部抬高，你從後面用手指或假陽具進入他的身體。

男友加班、出差、出差……我都气喘吁吁地和我讨厌的中年经理张开双腿舔我……早坂姬 - 早坂ひめ

And quite a lot of Chinese hashtags associated with these beauties and their stylings popped out in China's incredibly hot look for end result.