smart man+smart woman=romance
smart man+dumb woman=affair
dumb man+smart woman=marriage
dumb man+dumb woman=pregnancy

office arithmetic
smart boss+smart employee=profit
smart boss+dumb employee=production
dumb boss+smart employee=promotion
dumb boss+dumb employee=overtime

shopping math
a man will pay $2 for a ! item he needs
a woman will pay $1 for $2 item that she does not need.

general equations $ statistics
a woman worries about the future until she gets a husband.
a man never worries about the future until he gets a wife.
a successful man is one who makes more money than his wife can spend.
a successful woman is one who can find such a man.

happiness
To be happy with man ,you must understand him a lot and love him a little.
To be happy with a woman, you must love her a lot and not try to understand her at all.

longivity
Married men live longer than single men, but married men are a lot more willing to die.

Propensity to change
a woman marries a man expecting he will change,but he doesn"t.
a man marries a woman expecting that she won't change,and she does.

discussion technique
a woman has the last word in any argument.
anything a man says after that is the beginning of a new argument.