What is Vaginismus? Vaginismus is medically defined as involuntary spasms of the pubococcygeus (PC) muscles, the muscles which surround the vaginal canal. Vaginismus is a physical disorder that can stem from psychological or physiological factors. On average, one in every 500 women will experience vaginismus. However, the true number of females with vaginismus is estimated to be higher because many females never report their…