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The Family Research Council, a conservative Christian think tank in Washington, D.C., argues in the book Getting It Straight that finding people are born gay "would advance the idea that sexual orientation is an innate characteristic, like race; that homosexuals, like African-Americans, should be legally protected against 'discrimination;' and ...
MHC-based sexual selection is known to involve olfactory mechanisms in such vertebrate taxa as fish, mice, humans, primates, birds, and reptiles. [1] At its simplest level, humans have long been acquainted with the sense of olfaction for its use in determining the pleasantness or the unpleasantness of one's resources, food, etc.
The CDC (2015) reported that gay and bisexual men accounted for 82% (26,375) of HIV diagnoses among males and 67% of all diagnoses in the United States, while six percent (2,392) of HIV diagnoses were attributed to injection drug use (IDU) and another 3% (1,202) to male-to-male sexual contact plus IDU. Heterosexual contact accounted for 24% ...
Circumcision in sub-Saharan Africa "reduces the acquisition of HIV by heterosexual men by between 38% and 66% over 24 months". [122] Owing to these studies, both the World Health Organization and UNAIDS recommended male circumcision in 2007 as a method of preventing female-to-male HIV transmission in areas with high rates of HIV. [123]
While direct effects are hard to measure for ethical reasons, animal experiments where scientists manipulate exposure to sex hormones during gestation can also induce life long male-typical behavior and mounting in female animals, and female-typical behavior in male animals. [6] [19] [17] [22]
Both male and female use voice, face, and other physical characteristics [34] to assess a potential mate's ability to reproduce, as well as their health. [33] Together with visual and chemical signals, these crucial characteristics which are likely to enhance the ability to produce offspring , as well as long-term survival prospects, can be ...
The front commission was found to be wider in homosexual men than heterosexual men, and the corpus callosum was found to be larger in homosexual men than heterosexual men. [ 9 ] Some areas of the brain which researchers looked at but did not find differences in structure between sexualities are the temporal cortex, hippocampus and putamen.
Two of the most famous studies of the demographics of human sexual orientation were Alfred Kinsey's Sexual Behavior in the Human Male (1948) and Sexual Behavior in the Human Female (1953). These studies used a seven-point spectrum to define sexual behavior, from 0 for completely heterosexual to 6 for completely homosexual. Kinsey concluded that ...