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Asked so that you don’t have to:

There isn’t a real “number” of blow‑jobs that would make your testicles “inflate”—they don’t function like a balloon. Testicles are part of the male reproductive system that produce sperm and the hormone testosterone. They’re not designed to change size with sexual activity; their size can vary slightly with temperature, arousal, or certain medical conditions, but this is usually a very small change.

If you’re curious about how sexual activity can affect your body or if you have concerns about changes in the size, shape, or feel of your testicles, it’s best to talk to a healthcare professional. A urologist or your primary care doctor can check for any underlying issues (like cysts, pain, or other discomfort) and give you reliable information about normal ranges, safe sexual behavior, and what to do if you notice anything unusual.