Some even market their products as “fitness accessories.”
There is currently no scientific evidence that supports the use of these devices.
In some cases, they may even cause irreversible damage to the penis.

Verywell / Alex Dos Diaz
Verywell / Alex Dos Diaz
What Is Penis Stretching?
These include vacuum pumps and traction devices that exert pressure on a flaccid (soft) penis.
Penis stretching is typically pursued by people who think that their penis is too small.

Is the Penis a Muscle?
The penis is not a muscle.
Proponents claim that these exercises create “micro-tears” in the tissues of the penis.
Penile Stretching
Penile stretching exercises are done while the penis is flaccid.
They generally involve gripping the head of the penis and pulling the penis in different directions.
The position is then held for several seconds and repeated.
Jelqing
Jelqing is an ancient Arabic technique said to increase girth.
This is recommended for up to 20 minutes a day.
Penis Stretching Devices
There are also different types of penis-enlargement devices available, includingpenile traction devicesandpenis pumps.
Penile Traction
Penile traction devices are also based on the micro-tear theory.
Between the two are adjustable rods that you’ve got the option to extend or retract.
Over time, the space between the rings is extended to “grow” the penis.
Can Viagra Increase Penis Size?
Viagra (sildenafil)does not increase the size of a penis.
It treats erectile dysfunction by increasing blood flow into the spongy interior of the penis.
Once the effects of the drug have waned, the penis will soften and return to its normal size.
To perform penile stretching:
Do not stretch to the point of pain.
If there is pain, you are pulling too hard.
Jelqing is done as follows:
Stop if you experience any pain or develop an erection.
If there is any pain, stop and remove the gear.
Never use the gear when tired or sleepy as you might fall asleep with it on and cause damage.
Depending on the technique used, the results you’ll see may be minimal at best.
Participants reported being “moderately satisfied” with the results.
However, the gains were eventually lost once the practice was stopped.
That said, some stretching exercises can be of benefit to certain groups.
Risks of Penis Stretching
Handling the penis aggressively in any way can cause damage.
As a general rule, if the procedure hurts, stop.
This includes manual stretching, jelqing, penile traction devices, and vacuum penis pumps.
To date, there is little evidence that any of these techniques work.
In some cases, there is a greater chance of penile injury or deformity.