'Gym penis' explained: Why your bulge shrinks when you work out

What is gym penis?

Admittedly, “gym penis” or “gym dick” sounds a little ridiculous, but it is a real phenomenon, according to Dr. David Shafer, a board-certified plastic surgeon and owner of Manhattan-based plastic surgery and medical spa Shafer Clinic Fifth Avenue.

“It refers to the temporary shrinking or retraction of the penis and scrotum that many men notice during or right after an intense workout,” he says. “It’s completely normal physiology — not a sign of any problem or lack of manhood — and something I hear about regularly from patients.”

Just like "summer penis," which causes your dick to grow, "gym penis" is all about blood flow. This happens when the body’s natural stress response redistributes blood flow, causing the dartos and cremaster muscles to contract. “During exercise, your body prioritizes sending blood to the working muscles and vital organs to support performance and oxygen delivery,” Shafer explains. “This temporarily reduces blood flow to nonessential areas during workouts like the penis and scrotum.”

The 20 to 50 percent reduction in flaccid girth and length — from the testicles drawing closer to the body and the penis retracting slightly — is more pronounced in people during strenuous or prolonged workouts (think weightlifting, HIIT, or running), and in people who are less physically fit, are dehydrated, or are working out someplace cold.

Is gym penis temporary?

Luckily, going from having an anaconda to a garter snake when you exercise is completely temporary. “Once you finish exercising, cool down, rehydrate, and return to a relaxed state with normal blood flow restored, everything typically returns to baseline within minutes to an hour,” Shafer says.

This is why you shouldn’t stress about it even if you feel self-conscious in the moment. “Your body is doing exactly what it’s supposed to do,” he says. “Focus on strength, health, and feeling good in your skin — the rest is just biology doing its thing.”

Does gym penis cause any negative side effects?

Gym penis is “a protective, adaptive mechanism” that causes no physical damage or long-term effects, Shafer says. But that doesn’t mean the issue doesn’t cause distress.

According to Sofie Roos, a bisexual licensed sexologist, relationship therapist and author at relationship magazine Passionerad, the only problem with gym penis is the psychological damage it does to some queer men, the demographic she works with the most in her practice.

She says that gay men — especially those who view the gym as a place to find their next hookup — worry about “how they look and are perceived by others,” and it may even hold them back from “hitting on a person they otherwise would have flirted with.”

But since gym penis is only a problem when you’re flaccid, if you hook up after your workout “and get a boner, then you’ll be as big as you always are, so don’t let this hold you back from having fun at the gym,” Roos says.

How does gym penis impact gay men?

No matter your sexual orientation or gender identity, gyms and locker rooms can make you self-conscious, especially when you’re stripping down to change or shower. But if you go to a gym where cruising is commonplace and hookup culture is alive and well, there can be an added layer of embarrassment if you look like you aren’t packing much once you start your workout.

“In environments where the gym also serves social or cruising functions, that visibility can heighten awareness and anxiety for some gay and bisexual men,” Shafer says. “However, it’s important to emphasize that this is a normal, transient physiological response that every man deals with. Partners and peers understand — or experience it themselves — and it doesn’t reflect on masculinity, attractiveness, or sexual capability. Open conversations about male body realities help reduce unnecessary shame.”

For queer men who “spend lots of time at the gym and use it as a sexual or romantic connecting point,” it is a very “sexually loaded situation,” where people may worry about being judged despite gym penis being a natural phenomenon, Roos says.

Even if you’re not trying to attract other men, gym penis can wreak havoc on your body image. Roos says that “straight men and gays who are not looking for a sexual partner tend to be worried and sometimes bothered by their gym dick as it feels un-masculine.”

What can you do about gym penis?

Shafer says there’s no need to hyper-focus on this very short-term problem. But if the shrinkage you experience while working out bothers you, there are a few options to make your bulge more prominent.

Going to the gym may cause gym penis temporarily, but working out can also help you look bigger down there. “Excess fat in the suprapubic (lower belly/pubic) area can bury part of the penile shaft, making it appear shorter,” Shafer says. “For every significant amount of weight lost — roughly 30 to 35 pounds in many cases — men often see a visible increase of up to an inch or more in apparent length as the fat pad reduces.”

But if you’re looking for more girth and length that will be noticeable even when flaccid, Shafer recommends hyaluronic acid fillers — he came up with the SWAG technique to give you the best overall results — or Botox injected into the cremaster and dartos muscles to help “reduce shrinkage or contraction” with minimal downtime.

“Long-term, investing in fitness, maintaining a healthy body composition, and addressing any underlying concerns (like low testosterone or vascular health) pays dividends in confidence and function,” he says.

Roos also says that you shouldn’t panic the next time you look down at the gym and aren’t happy with what you see, because all you need to do is “hit the sauna or take a hot shower” to plump your dick up again.

Sources cited:

Dr. David Shafer is a board-certified plastic surgeon and owner of the Manhattan-based plastic surgery and medical spa, Shafer Clinic Fifth Avenue.

Sofie Roos is a bisexual licensed sexologist, relationship therapist, and author at relationship magazine Passionerad,