Vaginismus

Vaginismus, sometimes anglicized vaginism, is the German name for a condition that affects a woman's ability to engage in any form of vaginal penetration, including sexual intercourse, insertion of tampons and/or menstrual cups, and the penetration involved in gynecological examinations. This is the result of a reflex of the pubococcygeus muscle, which is sometimes referred to as the "PC muscle". The reflex causes the muscles in the vagina to tense suddenly, which makes any kind of vaginal penetration—including sexual intercourse—painful or impossible.