TNG introduced the Trill as a one-off guest alien. DS9 effectively retconned the entire concept of the Trill; so I wouldn't take anything from The Host as having any long term consequences.
I would assume that without evidence to the contrary, most Trill fall into the same sexual orientation categories that would theoretically exist 400 years in the future: Heterosexual, Homosexual and everything in between. Individuals would be inclined to one orientation or another, and as mentioned upthread, those who are hosts to the Trill symbiotes would likely be more "flexible" about sexuality.
As DS9 has mentioned on more than one occasion, there are far more symbiotes available than chosen for joining, perhaps joined symbiotes generally do not breed. IIRC, when Ezri Dax was joined, the Dax symbiote was dying and needed a host, fast - I think that symbiotes cannot survive long without a host once they are joined.
I would assume that without evidence to the contrary, most Trill fall into the same sexual orientation categories that would theoretically exist 400 years in the future: Heterosexual, Homosexual and everything in between. Individuals would be inclined to one orientation or another, and as mentioned upthread, those who are hosts to the Trill symbiotes would likely be more "flexible" about sexuality.
As DS9 has mentioned on more than one occasion, there are far more symbiotes available than chosen for joining, perhaps joined symbiotes generally do not breed. IIRC, when Ezri Dax was joined, the Dax symbiote was dying and needed a host, fast - I think that symbiotes cannot survive long without a host once they are joined.