Female body shape is the cumulative product of a woman's skeletal structure (her build) and the quantity and distribution of muscle and fat on the body. There are, and have been, wide differences on what should be considered an ideal or preferred body shape, both for attractiveness and for health reasons. These have varied among cultures and at different times. As with most physical traits, there is a wide range of normality of female body shapes. Human beings and their cultures have perennially focused attention on the female body as a source of aesthetic pleasure, sexual attraction, fertility, and reproductive appeal.