Male sexual dysfunction can be classified according to the following categories: erectile dysfunction (ED), orgasmic, ejaculatory dysfunction, priapism, and decreased libido. Of these various disorders, medical therapy for ED is the most advanced. ED, also known as impotence, is defined as the inability to achieve or maintain an erection sufficient for satisfactory sexual function.1 In recent years, there has been an escalating public awareness of the magnitude of ED, partly attributable to the advent of Viagra™, Levitra™, and Cialis ™ and their associated marketing. The impact of ED is significant as its prevalence in men aged 40-70 years old was estimated at 52% by the Massachusetts Male Aging Study. Based on these data and the US population projection for the year 2020 of more than 62 million men 45-84 years old, ED will affect more than 31 million men and millions more over the age of 84.2,3 The projected worldwide prevalence of ED for the year 2025 will be staggering at 322 million men.
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