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Our glossary

Learn all about contraception, reproductive health & sex. Our glossary explains all terms understandably and neutrally β€” from A to Z.

Cervical mucus

Cervical mucus is a natural mucus produced by glands in the cervix. This serves to keep the cervix and uterus clean and protected by repelling any bacteria. It is also key to reproduction because it transports fertilizable sperm and passes them through the cervix into the uterus. Cervical mucus changes during the menstrual cycle, from dry and viscous to moist and creamy, in order to facilitate fertilization. Monitoring cervical mucus can also help determine a woman's* fertile days.

* While we speak of women and men, we are aware of the diversity of genders and demand better contraception for all people.