It is natural for a woman to give more than what she receives. To illustrate, consider your wife.
Give her a house, she will give you a home.
Give her groceries, she will give you a meal.
Give her a smile, she will give you her heart.
Give her your sperm, she will give you a baby.
So, be careful of what you give your wife.
If you any day you happen to give her crap,
She will surely give back shit that you will never forget.