Stacking and having sex with two midgets (preferably twins) while standing. One midget stands on the other's shoulders. You are making out with the top midget while the bottom one gives you head.
When at least five gay (or curious) guys watch a movie on a couch and enter each other by sitting on one another's laps. Being the bottom of the totem pole is the straightest position, whereas the top is the gayest. Basically a vertical train.