[Solved] Xue Lan is preparing a class presentation on the variables that influence sexual desire. Xue Lan's presentation should correctly mention that A) men put the same emphasis on social status and physical appearance in a mate as do women. B) there are cultural differences in sexual behavior. C) women and men are sexually aroused by the same kinds of erotic movies. D) everyone's sexual interest and activity declines as he or she grows old. Method of Concomitant Variations: A scientific method where one observes the changes in one variable alongside the changes in another, determining correlation. Sunlight: The light and energy that comes from the sun, providing warmth and facilitating photosynthesis in plants. Method of Concomitant Variations: A research method where one observes the effects of the deliberate variation of one factor on a phenomenon to identify causation. Necessary Condition: A necessary condition is a condition that must be present for an event or state of affairs to occur; without it, the event or state cannot exist.