The "private live show" booths at the back of some
porn shops and strip clubs, where a
girl strips, masturbates, and/or inserts dildos on the lighted side of the glass, while the paying customer jacks off in the dark on the other side of the glass. A few of them are fronts for prostitution or have glory holes, but most are just places for a guy to have a quiet private yank on his crank while a pretty
girl shows off to him.
Sandy got
tired of guys trying to get under the G-string when they tucked in a
bill, so she started working at the slut in a box club.
He didn't have the
money for a hooker or even for a rub-and-tug so he ended up going to a slut in a box.