what I gathered is kinda just “it’s complicated but it’s not just pitch”).

i’m a musician, so this is the way i think of it: men sound like woodwinds, women sound like strings. sometimes the pitches overlap, but usually women are an octave higher. if you start as a lyric soprano and can stretch yourself down to alto, or as a bass stretching yourself up to a tenor, you can get the rest of the way to “passing” just by changing your tone and cadence.