Members of Parliament (MPs) will get to vote for the first time on gay marriage in England and Wales on 5 February.
The Marriage (Same Sex Couples) Bill was given its first reading in parliament today, a two-minute long formality with no debate.
The bill was introduced by Maria Miller MP, Minister for Women and Equalities, in the House of Commons.
The leader of the Commons Andrew Lansley announced the first major debate will take place at the second reading on 5 February.