Yes, that's true. Ingenuity helps. Actually, I have occasionaly thought back on that and, since I usually have a pen with me, I decided that I am always armed and dangerous! I think the important thing is having the will to fight back.
Sometimes, the shock of an "unwilling" victim is enough to stop an attack.
No matter what happens or is threatened to happen, scream, yell, kick, bite , go for the gonads...*whatever*...raise hell and draw attention to what is happening to you.
Several women have been abducted near the local Wal*Mart and no one knew it was happening because the women went numb and silent from fear.
*Don't* do that.
Throw a HUGE fit.