There never was, and never will be again, another period quite like the 1980s and '90s for heartthrobs. Big movies had become blockbusters, TV sets were getting more than three channels, and the celebrity world was expanding rapidly. The Reagan '80s gave way to the Clinton '90s and Generations X and Z had little to worry about. There were no drafts sending them to war. It was a good time to grow up.The relative safety of the '80s and '90s in the States meant kids could simply be kids. And…