Who's male and female, and why? A and B worked for the same company. In a forum of fashion designing performance, while A was speaking B kept nodding and saying “yes”, “mm” or such kind of language frequently. Finally, when A finished and asked for B’s opinion, B said, “I really don’t think that plan will sell the product.” A, confused, then asked, “ Then why were you agreeing the whole time when I made my presentation?”