Well.. it's definitely not a sign of any STD. The testicles are supposed to be cooler than the rest of your body.. that's why they are on the outside. Sperm production need a cooler environment. It may also be that your hands are just particularly warm - which can happen with anxiety (like worrying you might have an STD). Cold balls are nothing to worry about. If you notice any other symptoms, or they turn purple / blue, you should see a doctor.
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