Since Fosan culture does not view emotional and physical relationships as being related subjects, there is no real stigma associated with same sex pairings. So long as the individuals involved still contribute to genetic diversity. Typically through natural means.
I do have plans to address the occasional outlier that does not want to contribute naturally, but that requires medical advancements by Mistral, which seems to still be in the air at the moment.
* * *
As for the subject of Pilum, Chiu would likely appreciate the sense of efficiency she would get from them, but she is not really sure how she feels about caste systems.
She understands why an assigned role is necessary for some societies, but having a role set does not allow much in terms of personal development.