Even in civilized mankind faint traces of monogamous instincts can be perceived. - Bertrand Russell
I don't think it's the nature of any man to be monogamous. Men are propelled by genetically ordained impulses over which they have no control to distribute thair seed. - Marlon Brando
The psychology of adultery has been falsified by conventional morals, which assume, in monogamous countries, that attraction to one person cannot coexist with affection for another. Everybody knows that this is untrue. - Bertrand Russel