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English: This video is an example of a man and woman having penile-vaginal intercourse in the standing position, a relatively normal example of sexual intercourse. It begins with the insertion of a man's erect penis into a woman's vagina at 0:07, followed by pelvic thrusts, becoming faster, initially to stimulate the vagina as it continues to lengthen and become lubricated.
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In all mammals including humans, penile penetration of the vagina is an instinctual behaviour serving the continuation of the species. [46] [47] In humans, learned behaviour also plays an important role (sexual scripts). [48] From Shere Hite, there is the suggestion to define onset not by penetration, but by the covering of the vulva by the ...
Original file (WebM audio/video file, VP8/Vorbis, length 1 min 50 s, 2,224 × 1,080 pixels, 2.52 Mbps overall, file size: 33.08 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Woodruff, who has studied the effect of some chemicals found in plastics on human health, reproduction, and development for two decades, first started looking into microplastics in 2021.
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