Actually, I'm not too surprised the Samoans have banned this film. Generally speaking Samoans are deeply religious. They have a unique flavor of Christianity and it permeates nearly all aspects of their lives.
Not that sexual ambiguity is unknown in Samoa. Their society recognizes a transgender concept called Fa'afafine, where a male in a family can assume a female role and be raised and treated as a female -- but that apparently isn't the same thing as choosing to be homosexual.