The game is only played on the subway and surrounding platforms. The subway is perfect for their exercise in sexual daring because all of us who ride the train, see other regulars, sometimes for years on end, and never, ever take the chance to speak. Sex-Train, allows you? no encourages you and others to do the opposite. Here is how it works. Chose a member of any sex who you see on a regular basis standing, waiting for the subway. Make some sort of contact with her/she so that it's clear for a few days that you are easing into his/her space. Basically, it's understood by the both of you?.