Writing in the Irish Independent, Brennan noted the opposition supporters of traditional marriage have faced, and said he was "sick of the accusations being flung around that if you vote 'No' you are homophobic."

He commented: "I am voting 'No' because I don't want our Constitution to deny that it is a good thing for a child to have a mother and a father."

His powerful contribution to the debate came as members from Aontas—an association of Bible believing churches in Ireland—raised concerns about the impact same-sex marriage would have on schools and free speech.

Brennan, who represents Dublin GAA at Gaelic football, said he was "proud to love my gay family members and my gay friends," and that everyone, "regardless of sexual orientation, is an equal member of the human family."

And yet, he said, there is "more to the marriage debate than adult equality."

Click here to read more about the gay marriage referendum in Ireland.

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