Homosexuality is romantic or sexual attraction or behavior between members of the same sex or gender. As a sexual orientation, homosexuality refers to "an enduring pattern of or disposition to experience sexual, affectionate, or romantic attractions" primarily or exclusively to people of the same sex; "it also refers to an individual's sense of personal and social identity based on those attractions, behaviors expressing them, and membership in a community of others who share them."

Homosexuality is one of the three main categories of sexual orientation, along with bisexuality and heterosexuality, within the heterosexual-homosexual continuum (with asexuality sometimes considered the fourth). Scientific and medical understanding is that sexual orientation is not a choice, but rather a complex interplay of biological and environmental factors. While some religious organizations hold the view that homosexual activity is unnatural or dysfunctional, research shows that homosexuality is an example of normal variation in human sexuality and is not in and of itself a source of negative psychological effects. Prejudice and discrimination against homosexual and bisexual people, however, have been shown to cause psychological harm.

John Corvino (born 1969) is an American author, lecturer, and professor of philosophy at Wayne State University.

Corvino attended St. John's University in New York City, graduating with a bachelor of arts degree in 1990. He earned his PhD in philosophy at University of Texas at Austin in 1998.

Dr. Corvino is an associate professor in the Department of Philosophy at Wayne State University in Detroit, Michigan. He began teaching there in 1998 and received tenure in 2007. His focii are ethics, applied ethics, and early modern philosophy. Other areas of philosophy which he has concentrated are the philosophy of religion, social philosophy, and political philosophy. His dissertation involved David Hume, and Corvino has taught classes focusing on Hume as well as British empiricism.

He has written and lectured extensively on gay rights. He has also written on business ethics.

Corvino has contributed to many academic journals and periodicals, including Gay and Lesbian Review Worldwide, Southwest Philosophy Review, Business Ethics Quarterly, Philosophical Quarterly, and Ethics. He is a columnist for Between the Lines and the online Independent Gay Forum.

Frederick Antony Ravi Kumar Zacharias (born 1946) is an Indian-born, Canadian-American evangelical Christian apologist. Zacharias is the author of numerous Christian books, including Gold Medallion Book Award winner Can Man Live Without God? and bestsellers Light in the Shadow of Jihad and The Grand Weaver. He is the founder and chairman of the board of Ravi Zacharias International Ministries, host of the radio programs Let My People Think and Just Thinking, and visiting professor at Wycliffe Hall of Oxford, where he teaches apologetics and evangelism. Zacharias studied as a visiting scholar at Cambridge University and held the chair in Evangelism and Contemporary Thought at Alliance Theological Seminary from 1981 to 1984. Commentator Chuck Colson referred to Zacharias as "the great apologist of our time."

Zacharias was born in Madras, India. Zacharias claims descent from a woman (of the Nambudiri Brahmin caste) and a low caste Boatman. Missionaries spoke to one of his ancestors about Christianity and thereafter the family was converted. Zacharias grew up in a nominal Anglican household, and he himself was an atheist until the age of 17, when he unsuccessfully tried to commit suicide by swallowing poison. While in the hospital, a local Christian worker brought him a Bible and instructed his mother to read to him out of John 14. Zacharias says that it was John 14:19 that touched him and caused him to commit his life to Christ.