This is a simple Mantra Sadhana I found which promises protection not only from potential rapists; but also from the anti social elements who are troubling a woman.
The woman has to take 5 leaves of the Ashoka Tree [Saraca asoca] and first keep them in the Pooja Place at home and apply a Tilak of Kumkum on them. Then she must offer Dhoop and Diya and chant the mantra – Ramaya Namah || [रामाय नमः ||] and remember the image of Shri Ram , with the Bow and Arrow in his hands. Then she must keep the leaves in her purse with a small prayer asking Shri Ram to protect her.
This Prayog has to be commenced on a Friday of the Shukla Paksha of the Hindu Lunar Month. When the leaves become dried, the woman must crush them and keep them is a clean place near the bottom of the trunk of the Ashoka Tree.
After this she can repeat the same Prayog again, however there is no need to wait for the Friday of the Shukla Paksha, it can be repeated on any day.
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