NEW YORK - Famed as a hotbed of debate over academic freedom, New York's most elite school is also a playpen for sexual high jinks. While their parents shell out $33,246 a year in tuition, Columbia University students attend naked parties, flock to sex-toys workshops, broadcast porn on campus TV, bake anatomically correct pies for the "Erotic Cake-Baking Contest" and heat up the library steps in a mass makeout session More →