I have my reasons for calling Maya a lesbian. First - it is how she is presented in the first episodes, second - if the player does not pursue a romance with Maya we do not see any demonstration that Maya is attracted to men, she herself admitted that she was attracted to the MC because he completed a space void in her life left by Josy. Third - unlike Josy, who at various times makes it clear that she feels and has felt something for the MC at some point, if the player only chooses to be friends with Maya in Ep.4, she makes no mention in the next episodes that she would like to have had something more with the MC. An example of this will be when the MC, who didn't pursue Josy and Maya romantically in Ep.4, goes public with his new relationship. I'm sure Maya won't give a shit and will be extremely happy for the MC while Josy will want to cry with sadness. No matter which route, Maya always gave strong indications that she was just a lesbian.