Morning.
Last week, a Faithful Reader sent this question:
"Given the relative high viscosity of semen, what are the hydraulics required to shoot it three to four feet out the end of the cock? This amazes me, especially given the length from the prostate gland to the end of the boner and the pressure drop while travelling through the pee tube.
Thanks for your help and your blog!"
So, I did some digging. This is a good question.... Since the most satisfactory ejaculations are the ones with the most volume of cum and the most force, this is something a lot of men are interested in knowing. I've posted the equation v(V), "Volume times Velocity."
According to the Cleveland Clinic: What controls the force of the velocity are the ischiocavernosis and bulbocavernosus muscles surrounding the base of the cock, and the pelvic floor muscles. So those Kegel exercises I've suggested in various posts strengthen those. The level of arousal also plays a part by increasing the amount of cum, which is why a lot of men practice edging. The continued stimulation builds sexual tension, and the volume of cum increases as ejaculation is delayed.
Of course, age is a factor. The younger we are, the more muscle tone we have. Aging robs us of that with fading Testosterone levels.
Last is having a healthy nerve system - spinal cord or pelvic floor injuries may not completely kill the ability to get an erection, but they can reduce the signal pathway to the brain.
The force of ejaculation is primarily determined by the rhythmic, muscular contractions of the bulbocavernosus muscle (at the base of the penis) and the pelvic floor muscles, which squeeze fluid through the urethra.
The exact velocity and volume of the ejaculate are influenced by several core factors:
- Muscle Strength: Stronger pelvic floor muscles result in more forceful expulsions.
- Level of Arousal: Higher levels of sexual excitement trigger stronger nerve signals and more intense muscular contractions.
- Semen Volume: The actual amount of fluid (which dictates the distance of the force) ranges between 1.25 to 5.00 mL. This is affected by your body's hydration, the time since your last ejaculation, and natural hormone levels.
- Age: Younger males generally have more forceful ejaculations, as muscle tone and testosterone levels typically decrease with age.
- Nervous System Health: Intact nerve pathways from the spinal cord to the reproductive system are required to trigger the expulsion phase.
The documented Distance Record:
The maximum documented distance for human ejaculation in credible scientific literature is 8 feet (2.4 meters). This rare distance was noted during sexological studies conducted by researchers Alfred Kinsey as well as Masters and Johnson.
An urban legend widely claims a "world record" of 18 feet 9 inches (5.71 meters) by a man named Horst Schultz. However, investigative reporting confirmed this is a myth; the record does not exist in the Guinness World Records database, and urologists state such a distance is biologically impossible due to the natural limitations of the human reflex.
- The Average Range: For most individuals, semen travels 7 to 12 inches (30–60 cm), though it is entirely normal for it to simply seep out with very little forward propulsion.
- The "Rare" High Range: A small percentage of individuals with highly conditioned pelvic floor muscles and high semen volumes can reach 3 to 6 feet.
- The Maximum Limit: The absolute upper limit of human muscle contraction force tops out at the aforementioned 8 feet.
