It's true we've never seen direct evidence of homosexuality on the show but we have seen other information, which when combined with our present day knowledge allows us to deduce that there is homosexuality.
Same with female presidents. The lack of female presidents would contradict other information established in the show. And the reason we have not seen any is more the lack of imagination of the writers to always reach into the male bucket when they need a character to be harsh and authoritative.
And I think of your story takes place in 1961 in the US, Kennedy is president by default unless established otherwise, again applying our real world knowledge to the information given to us in the story.
Same with female presidents. The lack of female presidents would contradict other information established in the show. And the reason we have not seen any is more the lack of imagination of the writers to always reach into the male bucket when they need a character to be harsh and authoritative.
And I think of your story takes place in 1961 in the US, Kennedy is president by default unless established otherwise, again applying our real world knowledge to the information given to us in the story.