An easy explanation for the high number of trans girls who are poly is just that the base poly rate in the population is higher than what wider society allows (0%) and so, being already inherently counter-normative, trans girls are more free to just go for it
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It's also why trans people tend to have leftist politics, like MCR, and be gay.
Helena, Cancer, and Na Na Na (Na Na Na Na Na Na Na Na Na) are my favs.