The fact that males living in Melanesia spend 10 or more years in exclusively homosexual relationships,then spend the remainder of their lives in exclusively heterosexual relationships shows that:

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The fact that males living in Melanesia spend 10 or more years in exclusively homosexual relationships, then spend the remainder of their lives in exclusively heterosexual relationships suggests that sexuality is not necessarily fixed and may be changeable in some societies by social learning and cognitive restructuring. This challenges the idea of sexuality being determined solely by biological factors or psychoanalytic ideas of parental influence. There is no evidence to suggest that sexual selection does not occur within this culture, and legality may not be the only barrier to homosexuality in this context.

The Fact That Males Living in Melanesia Spend 10 or More