Aside from judging by their mere appearances, basically, the majority of boys tend to have a rash temperament, and they do things more directly without thinking in mind first, while the girls are careful and attentive, and they cope with details better. In addition, boys are rational in dealing with business and relationship, but girls are more emotional. When it comes to sex, boys and girls have different views too. For example, boys are easily temptd into having sex, while girls think that love should come first before sex. Moreover, save appearances, we can distinguish the ideas boys and girls have by means of Chinese signs, constellation, and blood-type as well. What we have in common is that, whether we're boys or girls, we have our temper, and we feel upset when in a bad mood. This is why I think appearances don't affect the truth that we're the same. And besides, we all need to live on the Earth. Therefore, apart from characters, the ways of talking, and the different attitudes toward sex, everything about boys and girls remains the same.
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