Try to wear tight jeans as little as possible.

Try to clean it every day. If there is slight foreskin, turn it over and clean it.

Moderate masturbation, don't carry ideological pressure, and treat sexual problems correctly.

Pay attention to protect the penis and testicles from injury when playing football and other activities, even if you are joking.

Pay attention to nutrition.

The above is the answer that I was chosen as a wonderful answer by my friends. I hope I can help you.

Hope to deal with it. Thank you.