@Submariner,
I followed the links you gave and I was very disappointed in the quality of the material. Very disappointed. The following links lead to the type of studies/papers I use to form my opinions and subsequently reference for my arguments.
Something relatively new (to me anyway), is that the focus here is on epigenetics rather than genetics. Examples are:
Homosexuality as a Consequence of Epigenetically Canalized Sexual Development
http://www.jstor.org/stable/10.1086/668167
Pedigree and twin studies indicate that homosexuality has substantial heritability in both sexes, yet concordance between identical twins is low and molecular studies have failed to find associated DNA markers
Study finds epigenetics, not genetics, underlies homosexuality
http://www.eurekalert.org/pub_releases/ ... 120612.php
According to the study, published online today in The Quarterly Review of Biology, sex-specific epi-marks, which normally do not pass between generations and are thus "erased," can lead to homosexuality when they escape erasure and are transmitted from father to daughter or mother to son.
A Genetic Study of Male Sexual Orientation
http://archpsyc.jamanetwork.com/article ... eid=495588
However, the rate of homosexuality among nontwin biological siblings, as reported by probands, 9.2% (13/142), was significantly lower than would be predicted by a simple genetic hypothesis and other published reports
Example of articles that are more accessable than the above may be found here:
Epigenetics May Be a Critical Factor Contributing to Homosexuality, Study Suggests
http://www.sciencedaily.com/releases/20 ... .htm[quote]
Epigenetics -- how gene expression is regulated by temporary switches, called epi-marks -- appears to be a critical and overlooked factor contributing to the long-standing puzzle of why homosexuality occurs.[/quote]
Scientists claim that homosexuality is not genetic — but it arises in the womb
http://io9.com/5967426/scientists-confi ... n-the-womb
A team of international researchers has completed a study that suggests we will probably never find a ‘gay gene.' Sexual orientation is not about genetics, say the researchers, it's about epigenetics.
I guess this should not come as a surprise so someone who has been paying close attention. This entry from 2008 for example:
Homosexual Behavior Largely Shaped By Genetics And Random Environmental Factors
http://www.sciencedaily.com/releases/20 ... 205430.htm
genetics and environmental factors (which are specific to an individual, and may include biological processes such as different hormone exposure in the womb), are important determinants of homosexual behaviour.
