Swiss voters will decide on Sunday whether to allow same-sex couples to marry and enjoy the same rights as heterosexual marriage partners, following a referendum campaign in one of the last Western European countries that still bans gay marriage.
The government and parliament approved same-sex marriage last year, allowing them to adopt children without parents from either partner, giving lesbian couples access to sperm donation.
The move was immediately challenged by a trio of nationalist and conservative Christian parties, which opposed extending the rights of same-sex couples beyond a basic civil partnership that has been legalized in Switzerland since 2007.
Under the Swiss constitution, any parliamentary decision can be subject to a referendum if at least 50,000 citizens request it.
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