Final answer:
True, the acceptance of homosexuality varied in ancient civilizations. Greek and Roman societies had instances of institutionalized same-sex relationships, though societal pressures for heterosexual marriage existed. Over time, attitudes became more rigid until challenged by the modern LGBTQIA+ movement.
Step-by-step explanation:
The statement that homosexuality existed in ancient civilizations without sanctions and was institutionalized among ancient Greeks and Asians as a natural expression of sexual instinct is largely true. In many ancient societies, there was a broad acceptance of sexual relations that went beyond heteronormative expectations. For example, in elite Greek culture, bisexuality was prevalent, and sexual attraction was not limited by gender, with relationships between men and adolescent boys being a part of the social fabric, especially in societies like Sparta with its warrior culture. Similarly, ancient Rome had no specific prohibition against female same-sex relationships, although societal pressure for marriage and procreation did exist. Despite more open attitudes in some ancient societies, this does not mean that there were no sanctions at all or that every society was accepting. Some cultures, particularly in later periods such as the Roman Empire, did exhibit a stigma towards individuals who engaged in exclusive same-sex relationships which interfered with the societal expectations of marriage and offspring. The nuanced history of homosexuality in ancient civilizations shows that acceptance varied by time, place, and context.
Over time, views on sexuality became more rigid, with the modern categories of 'heterosexuality' and 'homosexuality' developing and pathologizing same-sex attraction. The LGBTQIA+ movement in recent history has worked to challenge these notions and gain greater visibility and rights for individuals across the spectrum of sexual orientations.