Ramsey said they "didn't find it insulting" to be nominated for best actress at the Emmys.
Theroux suggested that having a single category would mean "basically a lot of women wouldn't get nominated" - as happened when the Brits scrapped their best male and female categories in favour of a best artist award, and no women were nominated in 2023.
Ramsey responded: "I think it's so important that that's preserved - that the recognition for women in this industry is preserved.
"I think the gendered categories conversation's a really interesting one and I don't have the answer. I wish that there was something that was an easy way around it.
"I think that it is really important that we have a female category and a male category - but then, where do non-binary and gender con-conforming people fit into that? I don't know.
"I've literally sat and tried to think my way to the answer, and haven't got there.
"You could do it for the character portrayed - like, best performance in a female character. But then, what about when there are non-binary characters on screen? Which is few and far between at the moment. But where does a non-binary person playing a non-binary character fit in? I don't know. It's really complicated."
There has also been a move towards referring to all performers as actors rather than using the term actress, but Ramsey said many people prefer to be called an actress "and are really comfortable in that".
"I've always just called myself an actor, but I don't think that those words [like actress] have to be taken away."