To compare and evaluate products at the expenses of a human being. Let's take two examples that I see everyday on TV in Lebanon. A Chinese woman is holding a tuna fish can. The woman is wearing a nightdress. Suddenly the man stops talking to her and begins to eat a Galaxy ice-cream, ignoring completely the woman.
Reasons vary from religious to educational and economic ones.
In regions were the majority are muslims you can notice that one poster is not exposed with the same degree of naked-body images as in Christian regions. In case were such poster are present reactions were limited to paint or tear these billboards, and sometimes comments were seen under the posters. Actually all billboards are on their way to be removed, not to protect people from such ads that cause accidents, but simply to regulate them in a country from now on completely devoted to tourism, business and banking.