Profuse bleeding after voluntary sexual intercourse is an uncommon reason for admission to the gynaecological wards. Out of 12 such patients admitted to the Ipoh Hospital over a three-year period, one patient had life-threatening upper vaginal injury after coitus. Blood replacement and conventional suturing failed to arrest the bleeding. Bilateral internal iliac artery ligation promptly arrested further haemorrhage. Vigorous intercourse increases intra-abdominal pressure in women causing tensing of the cul-de-sac, decreasing the elasticity of the posterior fornix, resulting in vaginal laceration. Bilateral internal iliac artery ligation produces a 'pelvic compartment hypotension' converting a high arterial flow system to that of a low one resembling venous flow. The useful role of this procedure to contain pelvic haemorrhage is discussed.