For more than three decades, Exodus International has been the leading force in the so-called ex-gay movement, which holds that homosexuals can be ''cured'' through Christian prayer and psychotherapy.

Exodus leaders claimed its network of ministries had helped tens of thousands rid themselves of unwanted homosexual urges. The notion that homosexuality is not inborn but a choice was seized on by conservative Christian groups who oppose legal protections for gay men and lesbians and same-sex marriage.

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