Replying to [HT Sourcing]:Dear Friend The proof would be valid if the premise is true. However seems to me that you missed the k-factors and the second term.
Girls = K1*time*money + K2*love*life
Because as they need time and money, they also give you love and life. As time = money and money = root of evil
Then girls = k1* evil + K2*love*life
But also angels give you love and protect your life Angel = love*life
Finally: Girls = K1*evil + K2* angel
Some girls manage to make the k2 = 0, others make the k1 = 0, but on average girls have a bit of both and with proper life experience they will adjust those factors for either way.
I like this formula better, so is now up to the man to look for the girl with the right k-factor for him. Some men love evil girls, some angel girl, what type of girl do you like?