I have seen women who want and desire a larger clitoris and achieve this with testosterone. Viagra works by increasing blood flow. We need blood flow in our erotic tissue and this is achieved safely by having a normal hormone balance. Female hormones give our tissue the ability to have normal sexual function. Natural hormones do not kill anyone and actually work.
Research is on-going to stimulate the brain with different medications.
Apormorhine and Uprima are under trail currently as medications to increase libido. Viagra was hyped for women , but the follow up was disappointing. This is because female sexuality is multi-focused. Male is much more focused on the penis. Pfizer is currently experimenting on European women with Viagra.