Interesting Theory . Formula

Human = eat + sleep + work + play
If, Pig = eat + sleep

Then, Human = Pig + work + play
Hence, Human - play = Pig + work
Conclusion : Human who don't play = Pig

Man = eat + sleep + earn money
If, Pig = eat + sleep

Then, Man = Pig+ earn money
Hence, Man - earn money = Pig
Conclusion: Man who don't earn money = pig

Women = eat + sleep + waste money
If, Pig = eat + sleep

Then, Women = pig + waste money
Hence, Women - waste money = pig
Conclusion: Women who don't waste money = pig

Theory:

Man earn money so that women won't become pig,
Women waste money because don't want men to become pig

Hence, MEN + WOMEN = PIGS