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It's just a concept for now, but this Aprilia Magnet looks like to be one of the most appealing phallic symbols ever ridden by man. Using a 550cc motorcycle engine, the low-slung trike has electromagnetic motors in its front two hubless wheels, meaning it maintains an extremely low center of gravity (low enough to make losing the rear passenger simply humorous and not tragic and humorous).

Thrice Bitten: Aprila s Three-wheeler Concept [Jalopnik]

http://www.jalopnik.com/cars/concept-cars/index.php#thrice-bitten-aprilas-threewheeler-concept-030903