Estimates and variance for the lesbian , gay and bisexual LGB population are subject to controversy and debate. Obtaining precise numbers on demographics of sexual orientation is difficult for a variety of reasons, including the nature of the research questions. Most of the studies on sexual orientation rely on self-report data, which poses challenges to researchers inquiring into the sensitive subject matter. More importantly, the studies tend to pose two 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 homosexual or bisexual.
Demographics of sexual orientation
Demographics of sexual orientation - Wikipedia
HIV particles red invade a human immune cell. When HIV is transmitted through sex, only the strongest versions of the virus establish long-term infection. A woman is twice as likely to catch the virus from an infected partner in a heterosexual relationship than a man is. And homosexual men are at even greater risk.
HIV/AIDS Annual Surveillance Statistics
Heterosexuality is romantic attraction, sexual attraction or sexual behavior between persons of the opposite sex or gender. Along with bisexuality and homosexuality , heterosexuality is one of the three main categories of sexual orientation within the heterosexual—homosexual continuum. Scientists do not know the exact cause of sexual orientation, but they theorize that it is caused by a complex interplay of genetic , hormonal , and environmental influences ,    and do not view it as a choice.
Human papillomavirus HPV has been identified as etiologic agent of various cancers for both men and women. However, HPV vaccine has not been recommended for men in China by far. To provide more evidences to promote HPV vaccination among males at high-risk of infection, this study investigated genital HPV genotypes among male attendees of sexually transmitted disease STD clinic. Data on sociodemographic characteristics and self-reported sexual behaviors were collected based on questionnaire.