How do people adapt to hot desert climates such as Sahara desert, Africa?

One thing that is really interesting about traveling is experiencing different climates to my home country. I am used to a warm summer, cool spring and autumn and a cold winter where I usually live. When I was 19 I went to Tunisia and it has hot dry weather. Some of it is desert. In such a place I wear cool cotton clothes to cover my body as well as sunglasses and a sun hat. Two other countries that I have been to have this sort of climate and these are Israel and Jordan. Oh my! It was incredibly hot there but as it was a dry heat I felt fine with the incredible heat. I drank lots of water whilst there. Another place that I have been to is Darwin in Australia during the wet season. It was very hot, humid and sticky there. I had a shower, dried myself then got wet again through sweat in two minutes. The insect life in Kakadu National Park was amazing. People had nets over their head or hats with corks hanging around the edge. A heavy rain storm gave some relief from the high humidity. I think a hot and humid climate is harder than a hot and dry climate. I love traveling to tropical islands and beaches so I like hot weather and I have learned to tolerate humidity.