I think boys shall pay the bill when going out for dinner with girls.
First of all, I think boys should take more responsibilities.
Girls tend to rely on boys who are generous and willing to take responsibilities.
It is not to say that girls are all gold diggers, but it will definitely show the manliness of boys when they paying for bills. The trait is just what the girls appreciate.
Paying for bills doesn't mean that it is not fair between boys and girls, it indicates good qualities such as responsibility, generosity and Initiative.
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需要更多的话，会继续补充。
希望对您有帮助。
For instance, if a boy goes on a date with a girl, if the boy refuses to pay the bill when having dinner, the girl will probably wonder what is wrong with the boy. She may ask herself questions like "Does he like me?", "Is he a reliable man?", or "Do I need to see him another time?"
Assume that if the boy pays the bill actively, the girl will not think of any excuses that can deny the boy. In contrast, she may probably feel a little bit of embarrassment of herself.
In a word, my opinion is that it is absolutely necessary for boys to pay the bills rather than the girls to. It is a good way to show a boy's good traits, and it has nothing to do with the equity between boys and girls.
多加了一个例子，以及最后的结论。
我写的是提纲性质的，您可顺着此思路对内容进行丰富。20分钟的辩论，不可能把所有要说的都写好，关键是要想好思路，以及应对对方的观点，做到心中有数。
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