 Same-sex couples are thus eligible for the same benefits and protections as opposite-sex couples (including adoption).Some cities also have civil union laws that continue to be in place as an alternative to marriage, but offer more limited rights.After the law was passed, Argentina became the country in the Americas to legalise same-sex marriage, as well as the in Latin America, and the worldwide, following Belgium, Canada, Iceland, the Netherlands, Norway, Portugal, South Africa, Spain and Sweden.