Two years after Viagra stormed the market and revived erections for millions of men, many women are asking if a women's Viagra exists as a solution to their sex life. Is there a Viagra for women?

The short answer is no โ€” at least not yet. But that could change within the next two or three years as drug companies and researchers race to develop a libido enhancer for a very large โ€” and underserved โ€” market.

Just how large? Some 43 percent of women suffer with sexual dysfunction, compared to 31 percent of men, according to University of Chicago researcher Dr. Edward Laumann. And some $2 to $3 billion will be spent within the next ten years on products aimed at improving the sex lives of these women.