Board Thread:Speculation House/@comment-66.116.33.1-20141103215403/@comment-24198837-20150126230911

Yang has simply shown no interest in females as romance partners as of yet. With her attitude and personality I could easily see her being bi, but there's been no in-universe reason to suspect that as of yet. It's a guess based off personality. A sensible guess, I'd say, but unfounded in the actions of the character as presented.