Does Working Out Make Your Penis Smaller? Sexologist Explains the Truth Behind Temporary Shrinkage — Smoking and Drinking Are Landmines

Many men care a lot about the size of their genitals. Sexologist Dr. Hsu Lan-fang recently shared that even healthy men can experience a situation where the penis “looks shorter” under certain conditions. In most cases, this is a temporary change, not permanent shrinkage.

In a YouTube video, Dr. Hsu explained that the most common reason the penis appears different in size is related to temperature. When the weather is cold, blood vessels constrict and the penis naturally retracts, making the effect especially noticeable in low temperatures. She half-jokingly suggested that choosing an overly cold destination for a honeymoon might not be the best idea.

Besides temperature, emotional and physical state also play a role. When a man is under high stress or tension, blood vessels constrict and the penis can look smaller. If sexual arousal is low — for example, right after masturbation — both hardness and length during erection may be less than usual. During intense fitness training, blood is prioritized to the working muscles, so the penis temporarily receives less blood flow and may appear to shrink. These situations usually return to normal after rest.

However, she also warned that some factors can lead to longer-term or even permanent effects. Long-term use of hormones or certain medications (including some used for bodybuilding) may interfere with the endocrine system and affect sexual function. Some people who take drugs to enhance fitness results may gain muscle while experiencing a decline in sexual function. Smoking and heavy drinking damage cardiovascular health, which can affect both hardness and length of the penis. In serious cases, this can make intercourse difficult — but improving lifestyle habits early still leaves room for recovery.

She also mentioned that improper sexual positions or masturbation techniques that cause repeated injury to the penis may lead to fibrosis or scar tissue formation, affecting appearance and elasticity. Long periods without erections, insufficient sleep, or prolonged lack of sexual stimulation can also reduce elasticity. For men with obesity, abdominal fat often covers part of the penis, making it look shorter visually.