Twin studies[ edit ] A number of twin studies have attempted to compare the relative importance of genetics and environment in the determination of sexual orientation. Self reported zygosity , sexual attraction, fantasy and behaviours were assessed by questionnaire and zygosity was serologically checked when in doubt. Other researchers support biological causes for both men and women's sexual orientation. Women showed a statistically non-significant trend to weaker influence of hereditary effects, while men showed no effect of shared environmental effects. The use of all adult twins in Sweden was designed to address the criticism of volunteer studies, in which a potential bias towards participation by gay twins may influence the results; Biometric modeling revealed that, in men, genetic effects explained.
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Krafft-Ebing's book was so popular among both laymen and doctors that the terms "heterosexual" and "homosexual" became the most widely accepted terms for sexual orientation. Many modern style guides in the U. Gay especially refers to male homosexuality,  but may be used in a broader sense to refer to all LGBT people. In the context of sexuality, lesbian refers only to female homosexuality. The word lesbian is derived from the name of the Greek island Lesbos , where the poet Sappho wrote largely about her emotional relationships with young women. The term homosocial is now used to describe single-sex contexts that are not specifically sexual.
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Along with New Zealand, Australia became the second country in the Asia-Pacific region to to make same-sex marriage legal. Germany On June 30, , Germany became the 15th European country to enact legislation allowing same-sex couples to wed. Colombia On April 28, , Colombia became the fourth country in Catholic-majority South America to legalize same-sex marriage, following Argentina, Uruguay and Brazil. United States Eleven years after same-sex marriage was first made legal in Massachusetts, the U. Before the ruling, 36 states and the District of Columbia had legalized same-sex marriage.
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