Physically women are not suited to do sayanapradakshina because it may harm their working of faminine organs. They can better perform bhakthi marga, like chanting the hare krishna mahamantra or they may do pada-pradakshinam. But when they do pada-pradakshinam its result will never be equal to that of the sayanapradakshinam.
If so, a man doing pada-pradakshinam also should get equal results.