It will be excruciatingly difficult - I think you will need huge support, huge help, lots of very strong, loving relationships."The interview was part of the discussion surrounding the Irish Marriage Equality Referendum taking place this year.
O'Brien added that the reward for living a life of chastity would be happiness, and added that abstinence was the sign of an altruistic person.
The nation with the highest percentage of redheads is Scotland at 13 per cent.
Ireland, once dubbed “the most Catholic country in the world” by the future Pope Paul VI, has become the first country in the world to adopt same-sex marriage by means of a popular vote.
"It is in eastern symbolism, you know the Yin and the Yang, the male and the female and there is a 'uniqueness' about that relationship."O'Brien added that she did not wish to judge anybody, and that she was just expressing her personal views.
Catholic catechism says that, while homosexuals must be accepted, gay sex is immoral and that they should remain chaste.
Archbishop of Dublin Diarmuid Martin described the result as a “social revolution.” “We [the Church] have to stop and have a reality check, not move into denial of the realities,” Archbishop Martin said.
As many as 5,000 redheads from around the globe descended on the city of Breda for a three-day festival celebrating the genetic trait.
Born in Dungarvan, County Waterford, O'Brien was educated at the Convent of Mercy, Dungarvan and later at the Mater Dei Institute of Education, Dublin.