Original sentence: In modern times, the term marriage is generally reserved for a state sanctioned union.Since the 12th century, marriage or holy matrimony has been a sacrament in the Catholic Church, as well as other Orthodoxes, where it is defined as a relationship between a man and a woman (although same-sex marriage is legal in some countries and states).Since the latter decades of the 20th century many of society's assumptions about the nature and purpose of marriage and family have been challenged, in particular by gay rights advocacy groups, who disagree with the notion that marriage should be exclusively heterosexual
Edited sentence: In modern times, the term marriage is generally reserved for a state sanctioned union of a man to a woman.Since the 12th century, marriage or holy matrimony has been a sacrament in the Catholic Church, as well as other Orthodoxes, where it is defined as a relationship between a man and a woman.Since the latter decades of the 20th century many of society's assumptions about the nature and purpose of marriage and family have been challenged, in particular by gay rights groups, who disagree with the notion that marriage should be exclusively heterosexual.Very recently, a small but growing number of nations and states have given official recognition to what some have termed gay marriage