Women in Western Culture
Women can equalize the strength disadvantage by learning how to receive the attack rather than overpower the attacker...
Women's Self Defense
Martial arts training is an excellent method to make women feel empowered. One learns to relax under pressure and use their wit rather than superior strength. The same is true for men as well.
Aikido and Tai Chi are two of the martial arts where you are most likely to find female practitioners. But women are quite capable of practicing any martial art of their choosing.