I don't have a citation to back this up, but from (possibly fallible) memory, "no-one is ever both male-fertile and female-fertile, even at different times." is provably and factually false.
It's *certainly* false when you consider non-humans, who do after all have a sex, and may well have a gender.
This may or may not be meaningful to your argument. :)
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It's *certainly* false when you consider non-humans, who do after all have a sex, and may well have a gender.
This may or may not be meaningful to your argument. :)