“…The common gynaecologic causes include pelvic examinations 2–4,18,20 , post-partum knee-chest exercises, 3,21,22 coitus, 3,4,16,19,23,24,25 oro-genital sex, 26–29 vaginal douching, 3,4,30 pelvic inflammatory disease, 31 hysterosalpingography 31 and water skiing. 32 The essential mechanism is the passage of air through the vagina, cervix, uterus and fallopian tubes into the peritoneum 3,4 or through a vaginal stump opening in patients who have had hysterectomies.…”