I think Ivy, in my opinion, doesn’t really feel sexual about anybody.
Set to join Gotham during season 3 are notable Batman canon villains The Court of Owls, The Mad Hatter, Killer Croc, (maybe) Harley Quinn, Solomon Grundy, and a new grown-up version of Poison Ivy.
So I think it’s going to be more about discovering how other people perceive her and what means.
I think that would be way further down the line especially since this is an origin story show.