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Posted by: Biack Rose66
Also, to refute the OP even more, his main argument is that people are not biologically wired to be attracted to the same sex. Recent studies published from the University of Chicago which found that -blam!--blam!-ity stems through pre-natal effects of hormones.
http://www.jstor.org/stable/10.1086/668167
Abstract: Male and female -blam!--blam!-ity have substantial prevalence in humans. Pedigree and twin studies indicate that -blam!--blam!-ity has substantial heritability in both sexes, yet concordance between identical twins is low and molecular studies have failed to find associated DNA markers. This paradoxical pattern calls for an explanation. We use published data on fetal androgen signaling and gene regulation via nongenetic changes in DNA packaging (epigenetics) to develop a new model for -blam!--blam!-ity. It is well established that fetal androgen signaling strongly influences -blam!- development. We show that an unappreciated feature of this process is reduced androgen sensitivity in XX fetuses and enhanced sensitivity in XY fetuses, and that this difference is most feasibly caused by numerous sex-specific epigenetic modifications ("epi-marks") originating in embryonic stem cells. These epi-marks buffer XX fetuses from masculinization due to excess fetal androgen exposure and similarly buffer XY fetuses from androgen underexposure. Extant data indicates that individual epi-marks influence some but not other -blam!-ly dimorphic traits, vary in strength across individuals, and are produced during ontogeny and erased between generations. Those that escape erasure will steer development of the -blam!- phenotypes they influence in a gonad-discordant direction in opposite sex offspring, mosaically feminizing XY offspring and masculinizing XX offspring. Such sex-specific epi-marks are -blam!-ly antagonistic (SA-epi-marks) because they canalize -blam!- development in the parent that produced them, but contribute to gonad-trait discordances in opposite-sex offspring when unerased. In this model, -blam!--blam!-ity occurs when stronger-than-average SA-epi-marks (influencing -blam!- preference) from an opposite-sex parent escape erasure and are then paired with a weaker-than-average de novo sex-specific epi-marks produced in opposite-sex offspring. Our model predicts that -blam!--blam!-ity is part of a wider phenomenon in which recently evolved androgen-influenced traits commonly display gonad-trait discordances at substantial frequency, and that the molecular feature underlying most -blam!--blam!-ity is not DNA polymorphism(s), but epi-marks that evolved to canalize -blam!- dimorphic development that sometimes carryover across generations and contribute to gonad-trait discordances in opposite-sex descendants.
Educate yourself, Flood.
First intelligent counterargument, good. I'll reply in a bit.