As an “all-female” humanoid species not bound to the traditional forms of mating, in that they reproduce through a form of telepathic parthenogenesis, the design of the Asari collapses boundaries of sex and sexuality. The Asari are a species rendered as Other, even in comparison to the various beings populating the gameworld. Characters recognize and struggle against prejudice and limited understanding of Asari customs, culture, and practices. These gameworld features allow for a space where awareness and exploration of sexualities outside of the heterosexual binary can take place.
Source: wiktionary