The demographics of sexual orientation are difficult to establish for a host of reasons discussed below. One of the major reasons for the difference in statistical findings regarding homosexuality and bisexuality has to do with the nature of the research questions. Major research studies on sexual orientation are discussed. Most of the studies listed below rely on self-report data, which poses challenges to researchers inquiring into sensitive subject matter. More importantly, the studies tend to pose two different sets of questions. One set examines self-report data of same-sex sexual experiences and attractions while the other set examines self-report data of personal identification as gay, lesbian, or bisexual. Fewer research subjects identify as gay, lesbian, or bisexual than report ha