The relationship of man and woman is the fundamental relationship that stands at the base of the whole social structure.
 Theodore Roosevelt, Theodore Roosevelt; an Autobiography (1913). copy citation

Context

“The Nation collectively will in this way be able to be of real and genuine service to each of us individually; and, on the other hand, the wisdom of the collective action will mainly depend on the high individual average of citizenship. The relationship of man and woman is the fundamental relationship that stands at the base of the whole social structure. Much can be done by law towards putting women on a footing of complete and entire equal rights with man—including the right to vote, the right to hold and use property, and the right to enter any profession she desires on the same terms as a man.” source