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1.
Doubletreeing It is the act of two people choosing to have sex in the window of a hotel in a high-traffic area specifically so people can watch. Originally termed for the Doubletree Manhattan where people frequently had sex in their hotel room window because of how easily people on the street can see.

Recommended positions include doggie and straddling so that people can see the most penetration. Maximum pleasure is taken when the couple sees another person masturbating and watching them.
Jean and Michael were Doubletreeing It during rush hour and she finished him with a blowjob while about 10 people watched.
by Thor Stark June 21, 2011