He and she
You see, he belongs to she
And in she there is a he.
She is xy
He is only y
If his y mates with her x out of her xy
Then the outcome is xy, namely a she
If his y goes with y of her xy
Then they get a y, a boy
But When she marries he
There must be a fission of their chromosome
Her xy must disentangle
Into singles of x and y
In order for one to match the single of his y
How the Interface will go
Is much by an accident
So what their offspring is like
Is chance or destiny