Scientists requested more detailed research over a very rare and not well understood sexual syndrome. Instead of failing to get aroused, thing about which many women complain, they suffer from the persistent sexual arousal syndrome (PSAS), experiencing constant feelings of excitement. Dr David Goldmeier of St Mary's Hospital in London stated: "Persistent sexual arousal syndrome occurs when a woman becomes involuntarily aroused for extended periods of time in the absence of sexual desire." The syndrome, embarrassing and very distressing for women, can seriously affect their lives. "Women with this clinical experience find the symptoms unwelcome since the genital arousal is usually persistent, unprovoked and unrelieved by orgasm. Women with persistent genital arousal report a high degree of psychological distress and even suicidal thoughts," Goldmeier added. The cause for this affection still remains unknown, but some women reported symptoms after taking some antidepressant known as selective serotonin reuptake inhibitors. These women reported symptoms lasting few days to a few weeks, or even for more than 18 months. It is also believed that the syndrome is caused by disorder in blood circulation around the genitals. PSAS is a physical disorder, a different form of nymphomania, which causes the blood flow to increase in the labia, vulva and clitoris. "It deserves continued research, not only because it is a distressing and perplexing condition, but also because ... treatment may lead to greater understanding of other aspects of female sexual response," Goldmeier asserted.