1. Tight underwear or pants 
Wearing very tight clothes increases heat and restricts blood flow — this can lower sperm quality and even cause pain or erectile issues over time.

2. Smoking 
Cigarettes damage blood vessels, including those that supply the penis. This can lead to weak erections and reduced sexual stamina.

3. Excessive alcohol 
Too much alcohol reduces testosterone levels and weakens erection quality. Occasional drinking is fine, but chronic use affects performance.

4. Poor hygiene 
Not cleaning properly can lead to infections, bad odor, and conditions like balanitis (inflammation of the penis). Always wash gently with mild soap and water.

5. Over-masturbation or rough sex 
Frequent or aggressive rubbing can cause sensitivity loss, soreness, or even small injuries. Give your body time to rest.

Keep your penis healthy by staying clean, hydrated, and active — and avoid habits that block blood flow.