They is used in this sense to refer to a singular person of unidentified gender, which has been in the language since sometime in the 14th century.
I used it because their sex is unimportant to the story, and of no concern to you.
You can't tell if your friend has a dick or not?
I know perfectly well what they have. Why are you so worried about it?
singular person of unidentified gender
Since the sex of the person has been determined, you can now proceed to use the correct pronoun.
Ask
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