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Civil unions between same-sex couples were legalised in Denmark, the first country to do so.

Historical image related to Civil unions between same-sex couples were legalised in Denmark, the first country to do so. from October 1, 1989

Civil union

Legal union similar to marriage

A civil union is a legally recognized arrangement similar to marriage, primarily created to provide legal recognition for same-sex couples. Civil unions grant some or all of the rights of marriage, with child adoption being a common exception.
Source: Wikipedia (CC BY-SA)

Same-sex relationship

Romantic or sexual relationship between people of the same sex

A same-sex relationship is a romantic or sexual relationship between people of the same sex. Same-sex marriage refers to the institutionalized recognition of such relationships in the form of a marriage; civil unions exist in some countries where same-sex marriage does not.
Source: Wikipedia (CC BY-SA)

Same-sex marriage in Denmark

Same-sex marriage has been legal in Denmark since 15 June 2012. A bill for the legalization of same-sex marriages was introduced by the Thorning-Schmidt I Cabinet, and approved 85–24 by the Folketing on 7 June 2012. It received royal assent by Queen Margrethe II on 12 June and…
Source: Wikipedia (CC BY-SA)