A Catholic nun has said she can see a future for the church, where priests can be married to both men and women.

Sr Jeannine Gramick co-founded the New Ways Ministry, a Catholic social justice centre working for the reconciliation of lesbian and gay people and the church.

Her books include 'Homosexuality and the Catholic Church', 'Homosexuality in the Priesthood and Religious Life' and 'The Vatican and Homosexuality'.

For more than 30 years, she has worked for justice for sexual minorities. For around 20 years, her religious community - the School Sisters of Notre Dame - assigned her to this church ministry.

But because of opposition to her work, she transferred to the US Sisters of Loretto in 2001.

Sr Gramick told the Pat Kenny Show here on Newstalk that the Chruch, and Pope Francis, are open to change on their views on gay marriage.

Earlier this week former president Mary McAleese called for a Yes vote in the May 22nd referendum, in an exclusive interview with The Right Hook on Newstalk.