It seems absurd, but if the Supreme Court rules that marriage is a Constitutional right then the IRS may deny tax-exempt status to schools that refuse to offer same-sex housing, just as it did to Bob Jones University in 1983, for denying housing to interracial married couples. http://www.christianpost.com/news/supreme-court-gay-marriage-ruling-could-create-religious-liberty-issues-for-christian-schools-charities-obamas-lawyer-admits-138417/