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Many people with OCD suffer from unacceptable or taboo thoughts. These thoughts typically focus on issues concerning religion, aggression and sex. OCD thoughts do not lead to acting on these behaviors, but rather the person with the thoughts spends a great deal of time and effort to prevent themselves from acting on the thought. If your thoughts about raping your girlfriend fall into this category then it could be OCD, and it can be treated with cognitive behavior therapy and/or medication (SSRI anti-depressants).
On the other hand, if these are thoughts you have when you get angry or that make you feel aroused or excited or you enjoy having, then it is not OCD and you have a different type of problem that also needs attention, but of a different sort. Either way you should seek professional help immediately. You don't need to be tortured by unwanted thoughts.
Best of luck,
Dr. Williams
Monnica T. Williams, Ph.D., Clinical Psychology
No Cost OCD Treatment: http://www.ocdproject.org