'Big Bang Theory' Showrunner Talks Sheldon and Amy's Big Moment (SPOILERS)

Sheldon Cooper having sex? At one point, the very notion would have sounded preposterous. Yet after more than five years of his peculiar courtship with fellow scientist Amy Farrah Fowler, the producers felt they had organically reached the juncture to make Thursday's much-ballyhooed episode a logical next step. Although there's a fairly rich trove of...