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The thing is, female sexual dysfunction (as far as a viagra equivilant goes) was cured in I belive the 1970's with the invention of Atroglide.
The mechanics of sex for men and women have nothing to to with physcial responses. For men it is the blood pressure in one part of their bodies, for women it is the lubrication produced by their equivilant organ.
All the Viagra in the world can not make you enjoy sex if you don't like who your partner is, the same is true for Astroglide.
Women and men while being raped will often orgasm. This isn't because of deep repressed desires to submit, but because the physical act of sex is largely mechanical. If you stimulate the right nerves, no matter how uninterested in the act you are, you will receive pleasure responses.
Esentially, Viagra is no more a male sexual dysfunction drug than astroglide. It may allow closeted gay men to make love to their wives more frequently, but it doesn't inspire either attraction or desire, it just inspires erection.
Trying to find a pharma answer to female sexuality is pointless, because we haven't found any true aphrodesiac that is universally effective.
You can use spanish fly, vitamin E, or old milwalkee, they have all been used by people over the years for great effect in getting in the mood. But the mood is internal, and is no differnt for men than for women, despite what the advertising claims.