There are a lot of different reasons why a woman would have sexual dysfunction.

Hormonal levels (especially testosterone) could easily affect a woman's desire to have sex. Medications, autoimmune diseases, cancer, high blood pressure, can all cause female sexual dysfunction. Viagra would not help in these situations.

Where Viagra will help is in creating more pleasurable sex in that the increased blood flow (that's how Viagra works, btw) would cause more lubrication, and quite possibly less pain during sex. It could also relax vaginal muscles.

But if a woman doesn't want to have sex, or can't enjoy sex as much as she should, I'm not sure if Viagra would really help- it might, it might not. If it is a psychosomatic thing, who cares as long as they get horny?

I'm sure the women here can tell you what roles the qualities in a partner, the status of their relationship, or their comfort level play in all that. But it of course plays a huge role compared to men. It is not at all that men don't care about those things, but they don't seem to be as neccessary in achieving orgasm. Be interesting to her the personal experience any women here have if they have taken Viagra.

-yawkaw