The House of Representatives on Wednesday agreed in principle to full marriage equality for homosexual couples against opposition by conservative parliamentarians.
Supporters of the proposal argued it was time for Switzerland as a liberal country to give gay marriage full legal status.
However, opponents, notably from the right-wing Swiss People’s Party, argued civil partnerships for gays and lesbians, introduced in 2007, was enough.
The debate, including the right for lesbian couples to sperm donations, is set to continue over the next few days.
Observers expect the bill to pass in the House, but approval by the Senate at a later stage is less certain.
Right-wing opponents have threatened to challenge a more liberal legislation to a nationwide vote.
The Swiss government in January came out in favour of same-sex marriage, as did the Protestant churches while the Catholic church refused to take a stance.
This content was published on
Nemo brought the Eurovision Song Contest to Switzerland with a victory on Saturday evening in Malmö, Sweden. It is Switzerland's third victory in the history of the music contest.
Switzerland abstains from vote on Palestinian bid for full UN membership
This content was published on
On Friday, Switzerland abstained from the vote at the General Assembly on granting the Palestinians new rights at the United Nations (UN).
Protein in abdominal fat could help shape obesity treatment
This content was published on
The study analysed fat cells from different locations in the body, and found that those in the abdomen have unique properties.
North African asylum claims fall after rapid Swiss processing
This content was published on
The accelerated procedure, now out of its test phase, has resulted in a significant drop in applications from North African countries.
This content was published on
The artist's song "The Code" focuses on their journey as a nonbinary individual. It is one of the favourites to win this year's contest.
This content was published on
Switzerland should pave the way to allow same-sex couples to get married and adopt children, a parliamentary committee has said.
You can find an overview of ongoing debates with our journalists here . Please join us!
If you want to start a conversation about a topic raised in this article or want to report factual errors, email us at english@swissinfo.ch.