Sexual reproduction was the processes by which DNA was passed on to offspring from more than one parent (called mates), via creation of new DNA from combined RNA from both parents. The act of sexual reproduction typically involved sex, which hinged on the usage of sexual organs which, in most species, were differentiated for males and females. Alternatively, DNA extracted from a male could be used to impregnate a female without the use of the sexual organs. (VOY: "Maneuvers") Interspecies sexual reproduction was possible, but might require medical asistance.