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There is little written on ejaculatory issues aside from timing problems (premature and delayed ejaculation) and hematospermia (blood in the semen). However, not a day goes by in my urology practice where I do not see at least several patients who complain about declining ejaculation function.
What does the word ejaculation mean?
Ejaculation derives from ex, meaning out + jaculari , meaning to throw, shoot, hurl, cast.
Trivia: You do not need an erection to ejaculate and achieve an orgasm. A limp penis cannot penetrate, but is very capable of ejaculation and orgasm. 
What happens to ejaculations as we age?
Ejaculation and orgasm often become less intense, with diminished force, trajectory and volume. What was once an intense climax with a substantial volume of semen that could be forcefully ejaculated gives way to a lackluster experience with a small volume of semen weakly dribbled out the penis. 
Men don’t like meager, lackadaisical-quality ejaculations and orgasms. Sex is important to many of us and getting a good quality rigid erection is foremost, but the culmination—ejaculation and orgasm—is equally vital. We may be 40 or 50 years old, but we still want to point and shoot like we did when we were 20. As the word origin indicates, we want to be able to shoot out, hurl or cast like an Olympian and we want that intensely pleasurable feeling of yesteryear.
Sexual climax consists of three phases— emission, ejaculation, and orgasm . When the intensity and duration of sexual stimulation surpasses a threshold, emission occurs, in which secretions from the prostate gland , seminal vesicles , epididymis , and vas deferens are deposited into the urethra within the prostate gland. During ejaculation the pelvic floor muscles contract rhythmically, sending wave-like contractions rippling down the urethra to forcibly propel the semen in a pulsating and explosive eruption. Orgasm is the intense emotional excitement that accompanies the physical act of ejaculation.  
Ejaculation is an event that takes place in the penis; orgasm occurs in the brain.
The process of emission and ejaculation is actually a very complex and highly coordinated neurological event involving several specific centers in the brain ( amygdala, thalamus and other areas), spinal cord and peripheral nervous system .
Less than 5% of the volume of semen is actually sperm and the other 95+% is a cocktail of genital juices that provides nourishment, support and safekeeping for sperm. 70% of the volume comes from the seminal vesicles, which secrete a thick, viscous fluid and 25% from the prostate gland, which produces a milky-white fluid. A negligible amount is from the bulbo-urethral glands, which release a clear viscous fluid (pre-come) that has a lubrication function. 
The average ejaculate volume is 2-5 cc (one teaspoon is the equivalent of 5 cc). While a huge ejaculatory load sounds like a good thing, in reality it can cause infertility. The sperm can literally “drown” in the excessive seminal fluid. 
Why does the seminal tank dry with aging?
As men get older, there are changes in the reproductive organs, particularly the prostate gland, one of the few organs in the body that enlarges with age.
The aging prostate and seminal vesicles produce less fluid; additionally the ducts that drain the genital fluids can become clogged. In many ways, the changes in ejaculation parallel the changes in urination experienced by the aging male. Certain medications that are used to treat prostate enlargement profoundly affect ejaculatory volume. Additionally, the pelvic floor muscles—which play a vital role in ejaculation—weaken with aging. 
What about the pelvic floor muscles?
The pelvic floor muscles play a key role in ejaculation. The bulbocavernosus muscle (BC) is the motor of ejaculation, that which supplies the “horsepower.” The BC surrounds the inner, deepest portion of the urinary channel. It is a compressor muscle that during sex engorges the spongy erection chamber that surrounds the urethra and engorges the head of penis. At the time of climax, the BC expels semen by virtue of its strong rhythmic contractions, allowing ejaculation to occur and contributing to orgasm.
A weakened BC muscle may result in semen dribbling with diminished force or trajectory, whereas a strong BC can generate powerful contractions that can forcibly ejaculate semen at the time of climax.
How to get the juices flowing again?
Pelvic floor muscle training can be a useful tool to improve ejaculation. The stronger the BC, the higher the ejaculatory horsepower and the better the capacity for engorgement of the erection chamber that envelopes the urethra, resulting in optimized urethral pressurization and ejaculation. The intensified ejaculation resulting from a robust BC can enhance the orgasm that accompanies the physical act of ejaculation.
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From Wikipedia, the free encyclopedia
Human male external reproductive organ
A flaccid penis, with surrounding pubic hair removed to show anatomical detail


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