It's the current medley ad for Mofos.com running on most sites. At one point there's a gal, you don't really see her face, riding reverse cowgirl on a guy sitting in a chair outdoors. Here's the sample image from mofos.com itself, which is not too helpful:
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Here's a screencap I took with a partial face:
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Here's a screencap I took with a partial face:
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