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

Vaginal mucus (or vaginal fluid) is a secretion secreted by the cervix and vaginal walls. Its main characteristics are its texture, color, and odor, which vary from woman to woman. In a healthy body, the discharge is watery, slightly sticky, and resembles raw egg white in appearance and color.

Why can drafts leave stains on underwear?
It’s normal: All women experience discharge that stains their underwear in varying shades of white. The most watery discharge is clear or milky. As it dries, the liquid portion evaporates, leaving a whitish or yellowish layer that may harden. This discharge is completely normal if:

There is no or only a slight salty smell.

It is not accompanied by burning or itching.
(If you experience these symptoms, consult a doctor to check your condition.)