When Taiwan became the first place in Asia to allow same-sex marriage last year, university professor Lois was among thousands of gay people who cheered and waved rainbow flags on the streets of the capital Taipei.

A year on, she and her Chinese partner still have no right to legally wed, like hundreds of such couples who face restrictions over international same-sex unions.

As Taiwan marked a year since passing its historic law in a region where gay rights progress is slow, LGBT rights groups called for a full recognition of same-sex marriage to protect couples and families.