They're typically called "Private Viewing Booths" and they can be found in the back of some porno shops. Often enough, holes are drilled into the walls so that you can share the experiece with the adjoining booths but many shops have what are called "Buddy Booths" where there is a window between both adjoining booths an electronic curtain that can be raised or lowered.
Most of these windows have a gap at the bottom for..well. you know.
Edit: If you're looking for hetero sex - look elsehwere.
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"Porn is a zoo of exotic animals that becomes boring upon ownership." -Nersesian
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