Cupid by William Blake Valentine's Day poem

Why was Cupid a boy,
And why a boy was he?
He should have been a girl,
For aught that I can see.

For he shoots with his bow,
And the girl shoots with her eye;
And they both are merry and glad,
And laugh when we do cry.

Then to make Cupid a boy
Was surely a woman's plan,
For a boy never learns so much
Till he has become a man.

And then he's so pierced with cares,
And wounded with arrowy smarts,
That the whole business of his life
Is to pick out the heads of the darts.