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You never have nothing to worry about.
A cold sore is caused by herpes simplex. Get a cold sore somewhere, and you now have herpes. If you touch your mouth, then touch your genitals, guess what - you now have genital herpes and can pass it on to your partner. Even if you were both 100% clean and 100% monogamous with each other, you've contracted an STD.
Duke are you saying that you can give yourself genital herpes just by touching a harmless cold sore in your mouth and then touching your genitals moments later????