**3. Prevalence of female sexual dysfunction**

Despite increasing scientist interest in female sexual difficulty and dysfunction, the true prevalence of female sexual dysfunctions (FSD) in the general population remains a contentious issue. One reason is the great deal of variation in the published prevalence estimates of female sexual difficulties/ dysfunctions. This variation may be due, in part, to real differences among populations, and the way FSD is measured (Lindau et al,. 2007). Lack of standardization of outcome measures is an important issue in the FSD literature which has been raised by previous authors. Also, different time frames have influenced the prevalence rate. If the period of study increases, prevalence increases, too (Mercer et al,. 2003).

The prevalence of female sexual dysfunctions, as reported in reasonably valid descriptive investigations, are showed in Tables 1-4. There are currently four international data sets with some information about women's sexual problem; five studies in Africa, eleven studies in Asia, eleven studies in Europe and eleven studies in America.

### **3.1 Sexual interest/desire dysorders**

Table 1 show that the low level of sexual desire prevails in 11.2%-66.4% of subjects in different age strata. This indicates that sexual arousal dysfunction with this large variation is a worldwide problem at different ages. In several countries, there is a clear decline in sexual interest at advanced ages.

### **3.2 Arousal/lubrication dysorders**

There are genital and psychological aspects for arousal disorders. But, they are not explicitly separated. Insufficient lubrication generally appears in almost 49% of women. Also, it seems that this problem is more common in two ends of reproductive ages.
