http://collectingsex.tumblr.com/post/17022022998/been-searching-for-this-gifs-source-forever
I’m nearly certainly this is from the Mike Leigh film Naked. Hope that helps.
A collection of hentai and the real thing, porn-wise. For perverts. Clearly, 18 and over, NSFW. No contents are mine, but credit is given where possible. Let me know your thoughts and I will let you know mine.
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February 29, 2012
Finally, a source.