I have given simple advice to a couple of girlfriends that cared to ask. Usually unarmed rape/assualt defense (because if the person is armed, running is the best thing to do). Like hands up and clawing the eyes, kicking the in-step/knee, kneeing the groin...fast stuff that will allow you to run away.
With the whole discussion on power generation or off-balancing/uprooting, I feel that striking areas of pain that cause the attacker to pause is the best. Like the kick to the inner heel/in-step from a high heel show hurts like hell and that opens it up for other self defense moves. I do stress that the most important thing to prevent is being lifted off the ground like in a bear hug or something like that.
"Don't Focus on the Fingers or You will miss all the Heavenly Glory!"
Morbicid-"Maybe some moves are made just so that, if u somehow manage to pull them off in a fight, u get some serious bragging rights.
Many famous fighters have done this (roy jones jr, chuck norris, Morbicid, etc)"