Fun question. I don't have an answer, but I enjoyed finding the Wikipedia entry:
Mammary intercourse - Wikipedia.
Quote:
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Originally Posted by Wikipedia
In this act, the man's penis is placed on the intermammary sulcus and squeezed between the woman's breasts and stimulated with an upwards and downwards sliding motion, usually with the aid of a sexual lubricant.
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Wow, that doesn't sound like fun anymore.
