Nintendo is not trying to provide "social commentary."
The localization of Tomadachi Life for North America will not allow for same sex relationships with a representative stating that they "never intended to make any form of social commentary."
Nintendo of America explained their stance in a statement saying "Nintendo never intended to make any form of social commentary with the launch of 'Tomodachi Life'. The relationship options in the game represent a playful alternate world rather than a real-life simulation. We hope that all of our fans will see that 'Tomodachi Life' was intended to be a whimsical and quirky game, and that we were absolutely not trying to provide social commentary."
A recent "Miiquality" campaign started by Tye Marini, a gay Nintendo fan from Mesa, Arizona, had the goal of getting same-sex relationships in the game's localization. In an interview he talked about the game's customization of Mii characters, saying "You name them. You give them a personality. You give them a voice. They just can't fall in love if they're gay."