මේ තියෙන්නේ මනෝ විද්යාව පිළිබඳ ලෝකයේ ඉහළින්ම පිළිගැනීමට ලක්වන ආයතනයක් වන රාජකීය විශේෂඥ
මනෝ වෛද්යවරුන් ගේ ආයතනය Royal College of Psychiatrists UK හි මතය.
Link 1 - https://www.rcpsych.ac.uk/pdf/PS02_2014.pdf
Link 2 -http://www.rcpsych.ac.uk/members/specialinterestgroups/gaylesbian/submissiontothecofe/psychiatryandlgbpeople.aspx
"Biological theories regarding GLB sexuality attempt to link sexual
orientation with DNA markers on the X chromosome or to demonstrate that
in utero maternal hormones have an effect on sexual orientation. Other
theories attempt to show that the brain of the male who is GLB is
anatomically different from that of the male who is heterosexual.
Studies show a concordance of sexual orientation in male twins who are
raised apart, lending support to the idea that biological factors
greatly contribute to the development of sexual orientation. Likewise,
Bell and colleagues conducted a study of 1500 individuals identified as
gay and lesbian through detailed interviews involving various aspects of
their childhood environment, including parental relationships.[6] They
concluded that adults who are GLB and adults who are heterosexual had
almost identical familial and sociological upbringing.
To date, research studies suggest that aspects of homosexuality are likely linked to genetic factors."
"The authors of a 2008 study stated "there is considerable evidence that
human sexual orientation is genetically influenced, so it is not known
how homosexuality, which tends to lower reproductive success, is
maintained in the population at a relatively high frequency". They
hypothesized that "while genes predisposing to homosexuality reduce
homosexuals' reproductive success, they may confer some advantage in
heterosexuals who carry them". Their results suggested that "genes
predisposing to homosexuality may confer a mating advantage in
heterosexuals, which could help explain the evolution and maintenance of
homosexuality in the population".[146] A 2009 study also suggested a
significant increase in fecundity in the females related to the
homosexual people from the maternal line (but not in those related from
the paternal one).[147]
A review paper by Bailey and Zuk looking into studies of same-sex sexual
behaviour in animals challenges the view that such behaviour lowers
reproductive success, citing several hypotheses about how same-sex
sexual behavior might be adaptive; these hypotheses vary greatly among
different species. Bailey and Zuk also suggest future research needs to
look into evolutionary consequences of same-sex sexual behaviour, rather
than only looking into origins of such behaviour.[148] "
මේ තියෙන්නෙ අදාළ විද්යා්ත්මක උපුටා ගැනීම්.References
කාටත් කියවලා සරලව තේරුම් ගන්න පුළුවන් wikipedia link 1, 2 මෙන්න.
The Royal College of Psychiatrists stated in 2007:
“ Despite almost a century of psychoanalytic and psychological
speculation, there is no substantive evidence to support the suggestion
that the nature of parenting or early childhood experiences play any
role in the formation of a person's fundamental heterosexual or
homosexual orientation. It would appear that sexual orientation is
biological in nature, determined by a complex interplay of genetic
factors and the early uterine environment. Sexual orientation is
therefore not a choice.[4] ”
The American Academy of Pediatrics stated in Pediatrics in 2004
“ Sexual orientation probably is not determined by any one factor but
by a combination of genetic, hormonal, and environmental influences. In
recent decades, biologically based theories have been favored by
experts. Although there continues to be controversy and
uncertainty as to the genesis of the variety of human sexual
orientations, there is no scientific evidence that abnormal parenting,
sexual abuse, or other adverse life events influence sexual orientation.
Current knowledge suggests that sexual orientation is usually
established during early childhood.[3][143] ”
The American Psychological Association, American Psychiatric
Association, and National Association of Social Workers stated in 2006:
“ However, the available evidence
indicates that the vast majority of lesbian and gay adults were raised
by heterosexual parents and the vast majority of children raised by
lesbian and gay parents eventually grow up to be heterosexual.[2] ”
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