When all statistics say the same thing, it's not a myth: it's an uncomfortable truth. :-)

Most wives lose sexual desire for their husband with time; every study says women's desire tanks in monogamous couples; even female therapists admit that (check Dr. Psych Mom blog).

Of course there's a minority of high-libido women like you, but it's a minority. Just because you and some of your friends are like that, doesn't mean most women are like you.

On average, men's testosterone levels are ten times that of women. Of course it varies greatly between individuals, but that's the average.