It's been reported Queen Elizabeth II opposed gay marriage when it was introduced in 2013, but admitted she could do nothing to stop it.
An anonymous friend told the Daily Mail newspaper that the Queen said: "I can only advise and warn."
Marriage (Same Sex Couples) Act 2013:
395 MPs in favour
170 MPs against
79 MPs abstained or did not vote
First marriages in England and Wales 29 March 2014
Scotland gay marriage laws come into effect 16 December 2014
Northern Ireland has not passed gay marriage laws
The Queen is Supreme Governor of the Church of England, which believes marriage should only be between a man and a woman.
Her friend said she supported civil partnerships, which were introduced in 2005. They allow gay couples to have similar legal rights to married couples.
The Conservative Party was divided over the issue of gay marriage, but David Cameron was able to push the change of legislation through with support from Labour and the Liberal Democrats.
A spokesman for the Queen said Buckingham Palace does not comment on private conversations.
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