Flip_flop
Why should numbers matter anyway.
If you saw a pamphlet which referred to a woman's partner as 'partner' it would not in any way be factually incorrect, right?
If however, you were a woman in a relationship with another woman, and you saw your partner referred to a the 'father of the child', that would be inaccurate. Changing to the catch-all 'partner' is the easy way to ensure accuracy across the board...because if you call your other half your wife, missus, boyfriend, girlfriend, ball and chain...the word 'partner' is still 100% accurate.
When you think of it like that, doesn't it make sense?