Lady Gaga may belt out that gays are “born this way,” but questions about the origin and unchangeability of homosexuality are central to at least five lawsuits, including two before the Supreme Court next month.

A key argument in the battle over same-sex marriage is whether homosexuality is inborn and “immutable,” and whether gays, as a class of people, need special protection or “heightened scrutiny” from the courts on equal-rights issues.

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