[Solved] Research indicates that there are no large gender differences in the A)incidence of masturbation. B)attitudes about casual sex. C)level of arousal to erotic materials. D)consistency with which men and women orgasm. Cooperative Factories: Manufacturing establishments run by a collective group of workers who share the profits and management responsibilities. Seventeenth Amendment: An amendment to the U.S. Constitution, ratified in 1913, that established the direct election of U.S. senators by popular vote, replacing their previous selection by state legislatures. Direct Election: A system of choosing political officials where voters directly cast ballots for the persons or party candidates they desire to see in office, without the intervention of electors or intermediaries. State Legislatures: State legislatures are the lawmaking bodies within each of the fifty states in the United States, responsible for creating state laws, determining state budgets, and serving as a check on the executive power of the state governor.