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1.
Having silent sex with someone who has not told you their name. This results in the repetition of the word "who" throughout the session, which is the only sound you should hear.
Phil: My neighbor told me he had sex with a stranger, but I all I heard was the word "who".

Steve: That is called Owl Sex my friend.
by The Educator of the Kama Sutra January 14, 2012