The first and last diagramm can be edited:

• Smart women + smart man = affair / relationship without marriage

• Stupid women + smart man = pregnancy on first "encounter" (even though the man has to be somewhat stupid for this one too)

• Smart women + stupid man = marriage

• Stupid women + stupid man = big family with social security checks and food stamps. Someone will most likely end up in jail.

Now guess why some people get married multiple times and some others most likely never will get married even though they are in a relationship.