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In 2001, Evolution and Human Behavior published a questionnaire survey of 57 heterosexual and 66 homosexual male subjects in the United States that found that homosexual subjects were no more likely to provide financial resources towards family members, heterosexual subjects were more likely give more financial resources to siblings than ...
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.
Dissection studies found that gay men had significantly smaller sized INAH-3 than heterosexual males, which is shifted in the female typical direction, a finding first demonstrated by neuroscientist Simon LeVay, which has been replicated. [19] Dissection studies are rare, however, due to lack of funding and brain samples. [6]
[8] [40] During development, the volume of the SCN and the cell counts reach peak value at approximately 13 to 16 months after birth; at this age, the SCN contains the same number of cells as was found in adult male homosexuals, yet in a reference group of heterosexual males the cell numbers begin to decline to the adult value of 35% of the ...
Darwin proposed two explanations for the existence of such traits: these traits are useful in male-male combat or they are preferred by females. [9] This article focuses on the latter. Darwin treated natural selection and sexual selection as two different topics, although in the 1930s biologists defined sexual selection as being a part of ...
Research has shown that a couple of the areas of connection between the hemispheres of the brain have differences in their size depending on sexual orientation. 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]
In early 2000, researchers discovered a small group of sex workers in Nairobi, Kenya, who were estimated to have sexual contact with 60 to 70 HIV positive clients a year without signs of infection. [6] These sex workers were not found to have the delta mutation leading scientists to believe other factors could create a genetic resistance to HIV ...
Two types of HIV have been characterized: HIV-1 and HIV-2. HIV-1 is the virus that was initially discovered and termed both lymphadenopathy associated virus (LAV) and human T-lymphotropic virus 3 (HTLV-III). HIV-1 is more virulent and more infective than HIV-2, [20] and is the cause of the majority of HIV infections globally. The lower ...