Are the two related? Yes and no. (Don’t you just hate that?)  

Premature ejaculation can be due to several factors. Masturbation can have nothing or everything to do with P.E. When done in excessive amounts, masturbation teaches you how to reach an orgasm more easily. For many young adults, the addicted to porn and masturbation can cause an imbalance of stress hormones, GABA, Serotonin, and Dopamine. Such imbalance often traps the individual into an addict's loop, which lead the progress into more severe stages of sexual exhaustion.

The Over and Under of Masturbation

Put simply, over-masturbation will lead to sexual under-performance by way of premature ejaculation, as well as other sexual problems. Normally, masturbation is a healthy sexual behavior. And like other behaviors, over-indulgence can lead to both psychological and physiological imbalances. Frequent masturbation and ejaculation will stimulate the acetylcholine along with the parasympathetic nervous functions.

The Science of an Ejaculation Caused by Masturbation. Masturbation and Exhaustion: Understanding the Link. Masturbation Is Affecting Your Bedroom Performance.  Read one of our success stories.  Learn how one athlete suffered from O.M. and P.E.

 
Excessive masturbation and ejaculation can, and often times will, result in over-production of sex stress hormones and neurotransmitters. An unnatural abundance of these hormones and neurotransmitters can cause the brain and adrenal glands to perform excessive dopamine-norepinephrine-epinephrine conversion, in turn, making the brain and bodily functions perform at an extreme level.

Recent research has indicated that increased stress hormones from excessive masturbation can disrupt the biofeedback mechanism of HPA axis in nervous system. Such disruption can put body in pathophysiological states with imbalance production of oxytocin that regulated the contracting ejaculatory tissues and ducts. ^[1]

Subsequently, there is a profound change in body chemistry when one masturbates excessively. This leads to premature ejaculation and other frustrating sexual side effects such as excessive pre cum leakage, lower sperm count, wet dream, or unsustainable erection. Herbal supplements can help you restore the balance of oxytocin regulation and healthy regulation of HPA axis so you can have a stronger ejaculation control.
 

What is "Premature?"

Some premature ejaculation cases are easy to diagnose, especially when the man ejaculates before he even enters a woman. In relationship terms, premature ejaculation can be described as ejaculating before the woman has an opportunity to orgasm. This is what over-masturbation can lead to – a disappointed woman and an unconfident man.

Vicious Cycle Needs To Be Stopped

Masturbation and frequent ejaculation depletes the brain and spinal fluids of acetylcholine, dopamine and serotonin and the hormones such as hGH, DHEA, testosterone, thyroxine (T4) and Triiodothyronine (T3), neurotransmitters that are responsible for normal bodily and brain functioning, including sexual performance.
 
The lack of these hormones and nutrients melts the brain’s acetylcholine, parasympathetic neurotransmitters, dopamine and endocrine functions. Frequent ejaculation also depletes the body of serotonin, which then strikes an imbalance of serotonin and melatonin production. Fix your P.E. problem by restoring serotonin, neuro-hormones, and repair weaken ejaculatory nerves by taking natural supplements containing Griffonia, Passion Flowers, and other powerful herbs.

Over-masturbation and abnormally high amounts of ejaculation deplete your body neurotransmitters and prostaglandin E-1 that can cause pain and lack of control during erection until the body can produce sufficient amounts of the nutrients. If you experience excessive amount of pre-ejaculate (precum) leak out before or long after ejaculation as indication of very weak ejaculation arc that needed to be fixed through Tao's technique or effective herbal supplementation.

REFERENCE
^1 Cedric Viero, Izumi Shibuya, Naoki Kitamura, Alexei Verkhratsky,Hiroaki Fujihara, Akiko Katoh, Yoichi Ueta, Hans H Zingg, Alexandr Chvatal,Eva Sykova, and Govindan Dayanithi, Oxytocin: Crossing the Bridge between Basic Science and Pharmacotherapy., CNS Neurosci Ther. 2010 October; 16(5): e138–e156.