Tall wife and short husband.

Have you ever seen any couple where the height of the husband is shorter than his wife. I have seen some. When i used to go in the park for evening walk, i always came across  a couple. The wife was few inches taller than the husband, and to be comfortable with their heights in public places like park they both had different ways. The husband was wearing shoes with high heels and the wife was in flat heel sandals. But then also the wife was taller. They both seemed to be uncomfortable walking together. Short Husband was walking ahead and tall wife was walking behind him to avoid the attention of people in the park.
          I do not understand why they were doing that. Why do they think so much about others thought ?  Why not to be happy with what we have.