This past week, France became the the 14th country to approve gay marriage. Take a look at this Economist article for details, “France’s parliament votes to legalise gay marriage and adoption.”
For a broader view of this issue, you may way to review this Pew Forum on Religion and Public Life report: Gay Marriage Around the World.
Our library has a number of books on same-sex marriage and alternative family structures.
You may also want to review this CQ Researcher report, Gay Marriage Showdowns.