This is a a somewhat unusual artifact, inasmuch as it’s an artistic rendition of what is usually the old-school “money shot” seen in a porn movie: the actor ejaculating dramatically for the movie camera and showering the actress. It doesn’t make as much sense as painted art, which is presumably what makes it unusual to see in this format:

ejaculation on a porn star's back

From the October 1982 Pleasure magazine, published in Germany.

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