The first woman went to the store, bought the man new clothes, new furniture, and new electronics for his man cave. The man was impressed.
The second woman put the money in the bank, to show how responsible and thrifty she was. Again, the man was impressed.
The third woman invested the money and turned the $10,000 into $20,000. Again, the man was impressed.
The man thought for a moment about how each woman had handled the money, and then he married the one with the largest boobs.