That's why I hate logic :P

WEll, if we are following logic in our lives, see what happens:

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Human=Dining+Sleep+Work+Play

Pig=Dining+Sleep

According to above: Human=Pig+Work+Play
So:Human-Play=Pig+Work

Conclusion: Human without play=Pig with work!

Man=Dining+Sleep+Make money
Pig=Dining+Sleep
According to above: Man=Pig+Make Money
Pig=Man-Make Money
Conclusion: Man without make money=Pig

Woman=Dining+Sleep+Spend money
Pig=Dining+Sleep

According to above: Woman=Pig+Spend money or Woman - Spend money=Pig

Conclusion: Women without spending money =Pig

Final conclusion:
To make woman not become a pig, Man make money！
To make man not become a pig, woman spend money！
Man+Woman=2 pigs

FINAL CONCLUSION: Do not be TOO LOGICAL :)