Botox could be used to treat a sexual condition which prevents women having full intercourse, scientists say. Iranian researchers have used the muscle-relaxing toxin - normally associated with wrinkle treatment - to treat women with vaginismus. The psychosomatic condition causes muscle spasms that prevent penetrative intercourse. Many thousands of UK women are thought to suffer from the condition, but cases are often unreported or undiagnosed. The work was presented to the European Fertility Conference in Berlin.