The Center for Disease Control and Prevention’s 2007 report, Adolescent Health in the United States, surveyed 10,000 teenagers and found that the vast majority of sixteen-year olds who reported only same-sex sexual attractions reported only opposite-sex sexual attractions one year later. Because these surveys produced such unexpected results, similar studies were soon replicated all over the Western world. The outcomes were almost identical, with population-based samples now reaching into the hundreds of thousands.