What is the function of the testicles during sexual intercourse?

Patient's question:

I haven't been feeling well lately and don't know what to do. What is the use of the testicles during sexual intercourse?

Doctor's answer:

Dear Inquirer,
It is important to understand that the male testicles are the most crucial sexual organs. If the testicular function is poor, it can directly affect sexual ability, especially erectile function and ejaculation ability. During sexual activity, the testicles generally experience a contraction, which helps the penis become harder for erection. This contributes to a normal sexual life, and there is no need to worry too much about this.

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