On Monday, NFL Commissioner Roger Goodell sent a memo to teams reiterating the league's anti-discrimination policy about sexuality.

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He says their concern is battling bullying in schools, discrimination at work and proposed state laws like the "don't say gay" bill or one outlawing a private university from including sexuality in its anti-discrimination legislation.

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Gill Wonpyong, a university physics professor who also works for the Seoul-based Coalition for Moral Sexuality, said homosexuality is "abnormal" and raised worries the anti-discrimination laws could allow schools to teach students that homosexual relations are normal and that criticizing them is wrong.

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