Other than lack of interest, arousal disorders and premature ejaculation or even the failure to ejaculate altogether, the most common sexual disorder really is male erectile dysfunction. The cause for this dysfunction is an enzyme called PDE 5, which during arousal is inhibited by the body in certain muscles (especially the penis). When this enzyme is inhibited, the muscles relax (contrary to popular belief that penis engorgement is caused by tense muscles) – and the relaxed muscles allow blood to fill in and since the muscles are not tense, allow the blood to concentrate within the muscle. This is what causes an erection. There are a number of generic drugs that may be used to inhibit PDE5, some with lower dosage requirements (since they last longer in the body or that are more selective about their focus on inhibiting PDE5).
(more…)

Any less than normal response during any phase of an arousal cycle may be called a sexual dysfunction or disorder. These would include but are not limited to arousal disorders, desire disorders, sexual pain and orgasm disorders.

Most of the common disorders that occur in both men and women are that of ‘desire’, ‘arousal’, ‘erection’ (only in males), ‘orgasms’, ‘premature ejaculation’ (again only in males) and ‘dyspareunia’ (pain during sex). The main effect of Viagra is that it relaxes muscles and increases blood flow, to particular areas of the body that normally would have increased blood flow, especially as seen during sexual activity. Its primary use is by males who have difficulty in achieving or maintaining an erection over any period of time. Other disorders like desire and orgasm are not directly treatable with Viagra use. Viagra however, is very effective in sorting out problems with arousal and introduces higher amounts of blood to fill the penis.
(more…)