One effect of cosmetics is that they highlight the sexuality of the women who wear them, by emphasizing lips and eyes and reddening cheeks. Therefore, for much of the nineteenth century those of the middle and upper classes did not consider makeup respectable. By the early decades of the twentieth century the view of cosmetics began to change. Women gained the right to vote in many places and began to gain other freedoms as well. The start of World War I in 1914 had brought a more public role for many women, as they took over the jobs left empty by men who had gone to war. They reddened their cheeks with rouge, and since hemlines were going up, many rouged their knees as well.