I found this spell on my site, which could be helpful. I'm not sure I'd call a potential rapist "an admirer" but I think it could be easily used for that purpose. But again, this spell has herbs in it. So if you have something simpler, please share it.
Banishing an Unwanted Admirer
Cast this spell three days or nights in a row when the Moon is waning. If you can't get your hands on fresh vervain leaves, use the dried ones that should be available at a local herbalist. You'll need about a handful of either. The spell is best cast outside. If this is not possible, it can be done indoors, but as it involves a fire, it must be done with great care.
You will need:
A well-stoked fire.
Consecrate the wood or coal before lighting the fire. When it is burning fiercely, throw the vervain on to the flames, calling out the name of the person you want out of your life as loudly and with as much passion as you can muster. Follow the name with these words, which should also be said with passion:
I need you not.
I want you not.
Leave my life now
And come back never.
And it harm none, so be it.
Spend a minute or two visualizing the person's face in the fire's smoke and watch it waft away from you - forever.
Author: Michael Johnstone - The Book of Spells - Positive Enchantments to Enhance Your Life