What we have succeeded in doing is not decreasing the incidence of yeast infections, but increasing the number of those infections which now do not respond to common treatment modalities. The normal vagina is a very acidic environment, and anything that alkalinizes the vagina can produce an environment very conducive to the growth of yeasts that are found in all of us. So, douching, even a little, kills the acid-producing bacteria indigenous to the vagina by the gajillions, and the natural acidic defense is lost. Never douche, ever. No tub baths.
Baths are for babies, showers are for adults.
I've never understood how people think they can cleanse themselves in a bath, what with sitting in the swill they've just washed off their skin. If you MUST bathe, shower well immediately afterwards. The Monistat people have it right. Bad things can happen to you, and to the environment. See your doctor.