Spontaneous contractions (peristalsis) of the non-pregnant uterus is widely investigated and the role of correct peristalsis is most important for correct sperm transport towards the fallopian tubes and implantation of the embryo, thus obtaining pregnancy. At the same time, an impaired uterine peristalsis is discussed to be the reason for lower pregnancy rates and may also account for heavy menstrual bleedings and menstrual pain.