the purpose of the present study was to examine differences in lifestyle factors such as physical activity among homosexual (gay or lesbian), bisexual, and heterosexual korean adolescents.the sample consisted of 74,186 adolescents from grades 7-12 (ages 12-18) who participated in the 8(th) annual korea youth risk behavior web-based survey in 2012. of this sample, only 11,829 provided enough inf...