If your wife’s underwear has such stains, you should know that

Composition of vaginal secretions
All mucous membranes require hydration. Vaginal health is maintained by a thick layer of secretions, composed of:

Secretions or mucus produced by the cervix, endometrium, and Bartholin’s glands.

Dead cells of the columnar epithelium of the cervix and vaginal epithelium.

Fluid that passes through the walls of the blood vessels that supply the reproductive organs.

A large amount of bacteria colonizes the vagina.

Secretions from the sebaceous and sweat glands at the entrance to the vulva.

In short, vaginal discharge is primarily composed of mucus, water, and cells normally present in the body. It’s a natural phenomenon, as normal as saliva in the mouth. When is vaginal discharge a sign of illness?
In typical conditions, the discharge is