I've been told that the acidity in my vagina is high and may be killing off sperm. Have you ever heard of such thing? If true, how can I reduce the acidity?

--Mary

The normal vaginal environment is supposed to be acidic, with a pH of 3.8 to 4.2. Overgrowth of lactobacillus, the normal "friendly" bacteria, may cause the vagina to be more acidic than usual, but it would be unlikely to kill sperm. Sperm are naturally alkaline (they neutralize acid) and buffer the vaginal acidity for several hours after intercourse.

If you are worried about your vaginal pH, see your doctor and ask to have your vaginal secretions pH tested -- it's very easy to do. If the pH is less than 3.8, you can lower the acidity (raise the pH) with a baking soda and water douche. If it's around the 4 mark, you're okay. If it is higher than 5, you may have an infection that should be treated.