Patrick Frater Asia Bureau Chief Culturally pluralistic and gender-diverse Taiwan is the backdrop for “The Chronicles of Libidoists,” a new film by Gilles Yang, a director whose three previous films have also explored the erotic. The story is inspired by “The Little Mermaid,” the traditional fairy tale in which a mermaid princess falls in love with a human prince. But in Yang’s hands there is a twist in that the mermaid turns out to be a boy.