Is it safe to do sexual intercourse with my girlfriend when she’s having her menstruation?

Surely menstrual blood is no more magic than any other kind of blood. But there may actually be a bit of wisdom behind these ancient taboos. Normally, as a protective mechanism against bacterial invasion, the vagina stays fairly acidic (pH of 3.5 to 4.0). But during menstruation, blood’s higher alkalinity slightly reduces the vagina’s acidity (to a pH of 5.0 or so), making it more susceptible to vaginal infections. Menstrual blood flow also flushes away some of the mucus that normally plugs the cervix, making it easier for microbes to invade the uterus and the deeper reproductive regions.

If neither partner is infected with anything, there’s no reason to worry that making love during her period will increase the risk of infection. But if he already has an infection, the couple should abstain from sex during her period. (Serious vaginal infections generally make themselves known by itching, burning, an unpleasant odor or vaginal discharge; they should be seen by a doctor right away.)

If the woman is carrying around some minor-league vaginal infection, her mate also runs a small risk of picking up urethritis – a painful, although usually not serious, infection of the urethra, or urinary drainpipe. The most serious worry of all, though, is AIDS. Since having sex during menstruation directly exposes the male to potentially infected blood, if she is a carrier of the human immunodeficiency virus (HIV) she must not have sex during her period.

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