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A seat in a bathroom shower that lets you jack off without getting caught. It’s usually made of tough wood or tile, so your back doesn’t scream in pain.
My buddy’s got a jack bench so good, he jacks off while the shower’s on and the neighbors think he’s just taking a break.
I sat on the jack bench for 10 minutes straight, and my back thanked me with a full-on hug.
The jack bench is like a throne for my private business, and I rule it with pride.