Of the 45.2% of people living in the Grand Duchy as part of a couple, nearly 9 in 10 (88.1%) are married (compared with 9.1% living together on an informal basis and 2.7% in a registered civil union ('PACS')), according to the census figures for 2011.
Married people are more likely to have children than people who are living together on an informal basis or have entered into a civil union.
Passage came just three weeks after Australians voted in favor of legalizing same-sex marriage, by a 62% to 38% margin, in a non-binding, nationwide referendum.
Along with New Zealand, Australia became the second country in the Asia-Pacific region to to make same-sex marriage legal.
The law of 4 July 2014 reforming marriage, which contains many other changes regarding marriage, came into force at the start of January 2015.
For those couples who wish to have a religious wedding, it must be borne in mind that a civil wedding must always take place before the religious wedding can be held.
So far, more than two dozen countries have enacted national laws allowing gays and lesbians to marry, mostly in Europe and the Americas.
In Luxembourg, any marriage must be preceded by a publication that is for 10 days in the commune of residence of two spouses.
Taxpayers who marry in the course of the year will receive two new tax cards.
These will be issued automatically (without the taxpayers' intervention) by the competent tax office, on the basis of the data received from the municipal administration.
The procedure is to send a written application, stating your reasons, to the Ministry of Justice.
A growing number of governments around the world are considering whether to grant legal recognition to same-sex marriages.