Some also considered bound feet to be intensely erotic, and Qing Dynasty sex manuals listed 48 different ways of playing with women's bound feet. Some men preferred never to see a woman's bound feet, so they were always concealed within tiny "lotus shoes" and wrappings. According to Robert van Gulik, the bound feet were also considered the most intimate part of a woman's body; in erotic art of the Qing period where the genitalia may be shown, the bound feet were never depicted uncovered. Howard Levy however suggests that the barely revealed bound foot may also only function as an initial tease.