In a study conducted in two large cities in China, MSM aged 18e24 years accounted for 58% of all HIV cases detected in a sample of 429 MSM aged 18e64 years [8]. In the United States, teenage and young MSM have accounted for an increasing proportion of new HIV cases [13]. Among U.S. males aged 13e19 years, around 90% of all new HIV diagnoses are from male-tomale sexual contact [13].