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Data generated from past analysis.
https://cn.pornhub.com/video/search?search=%E4%BA%92+%E7%9B%B8+%E8%87%AA%E6%85%B0
https://www.xvideos.com/?k=%E7%94%B7%E5%A5%B3%E4%BA%92%E7%9B%B8%E8%87%AA%E6%85%B0&related=
https://zh.wikipedia.org/zh-tw/%E4%BA%92%E7%9B%B8%E8%87%AA%E6%85%B0
https://cn.pornhub.com/view_video.php?viewkey=ph6391207b46489
https://zh.xhamster.com/videos/mutual-masturbation-2-real-orgasms-try-not-to-cum-xhyobT1
https://www.atube1cn.com/categories/945/mutual-masturbation?hl=zh
https://cn.pornhub.com/view_video.php?viewkey=ph5ff5b0e91dc32
https://www.pornhub.com/video/search?search=%E4%BA%92+%E7%9B%B8+%E8%87%AA%E6%85%B0
https://zh.xhamster.com/videos/mutual-masturbation-until-cumshot-playing-with-her-tits-xhZsrYF
https://cn.pornhub.com/view_video.php?viewkey=6541d49291e55