Guys Vs Gals

Yesterday was in chatting over the marriage and choices people take, while options are given. Me and my friend were discussing over the topic well few strange but truthful things came out of discussions. Scenario is same how a girl reacts and how a guy reacts :) ..
When a guy get to choose from three women to be with rest of his life he would choose the most beautiful one. where as a women would choose the most rich one. This put lot of other questions in mind. Why does this happens to most. why men choose the most beautiful of all, and women the richest of all. May be its just because that way they both think they would be happy...