An essentially slug-like Trill, Dax has lived several past lives in different humanoid hosts of both genders and currently resides in a female body.
Trill hosts voluntarily join with a symbiont, but once joined, both Trill and symbiont become biologically interdependent.¹
Dax is noteworthy in the Star Trek universe and in pop culture because s/he is inherently neither male nor female and openly bisexual in his/her current female form.
The Star Trek franchise has always championed human rights, addressing issues like racism, cultural imperialism, ageism and sexism, and the Jadzia Dax character seems to be Deep Space Nine’s way of challenging those who maintain that same-sex attractions are unnatural or ungodly.
¹ Trill – Xenobiology Database » http://www.geocities.com/Area51/nebula/4156/infirmary/xeno/trill.html
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