The new law allows same - sex couples to marry in civil or religious ceremonies . The first same - sex weddings could take place as early as next year . The law was backed by PM David Cameron but not his Conservative Party . The justices said legally married same-sex couples will now enjoy the same federal benefits as heterosexual couples , striking down a key provision in the Defense of Marriage Act . Religious groups have to ` ` ' in '' if they want to perform same - sex marriages .
The new law allows same - sex couples to marry in civil or religious ceremonies . The first same - sex weddings could take place as early as next year . The law was backed by PM David Cameron but not his Conservative Party . Religious groups have to ` ` ' in '' if they want to perform same - sex marriages .