A phase I randomized postcoital testing and safety study of the Caya diaphragm used with 3% Nonoxynol-9 gel, ContraGel or no gel

A single-size diaphragm used with a personal lubricant gel containing lactic acid appears to be safe and to function as well as the same diaphragm used with N-9 in preventing PMS from reaching midcycle cervical mucus.