Anejaculation

Anejaculation is the inability to expel semen from the penis during sexual activity or attempted ejaculation.

Some men with anejaculation can still experience sexual arousal, erection and orgasm, while others may also have difficulty reaching orgasm.

This distinction is important because ejaculation and orgasm are related but separate physiological processes.

A man may therefore experience the sensation of orgasm without semen being expelled.

Anejaculation can occur occasionally or consistently and may be lifelong or acquired later in life.

How does normal ejaculation work?

Normal ejaculation involves two coordinated phases.

Emission

During emission, sperm and fluids from the prostate and seminal vesicles are transported into the posterior urethra.

This process is largely controlled by the sympathetic nervous system.

Expulsion

During expulsion, rhythmic contractions of pelvic and urethral muscles propel semen through the urethra and out of the penis.

The nervous system coordinates both phases.

Damage to the spinal cord, peripheral nerves or autonomic pathways involved in ejaculation can disrupt this process and result in anejaculation.

Anejaculation vs delayed ejaculation

These conditions overlap but are not identical.

Delayed ejaculation means ejaculation takes significantly longer than desired or requires unusually intense or prolonged stimulation.

Anejaculation represents the more complete end of this spectrum, where ejaculation does not occur.

A man with delayed ejaculation may sometimes ejaculate under certain circumstances, while a man with complete anejaculation cannot expel semen despite adequate stimulation.

Anejaculation vs retrograde ejaculation

Anejaculation should also be distinguished from retrograde ejaculation.

In retrograde ejaculation, semen is produced and reaches the posterior urethra, but instead of exiting through the penis it flows backward into the bladder.

In anejaculation, seminal emission or expulsion may fail altogether.

Doctors can sometimes distinguish these conditions by examining urine collected after orgasm for sperm.

Anejaculation and male infertility

Anejaculation can make natural conception impossible because sperm-containing semen is not deposited in the female reproductive tract.

Importantly, many men with anejaculation may still produce sperm normally inside the testes.

For men seeking biological fatherhood, treatment can therefore focus on obtaining sperm or semen through assisted ejaculation or sperm-retrieval techniques.

Depending on the cause, options may include penile vibratory stimulation, electroejaculation or surgical sperm retrieval followed by assisted reproductive techniques.

Diagnosis starts with a detailed sexual, medical and reproductive history.

The doctor will usually determine whether the patient:

• Experiences sexual desire

• Can achieve an erection

• Experiences orgasm

• Produces any semen

• Has ever ejaculated normally

• Can ejaculate through masturbation but not intercourse

• Has symptoms of retrograde ejaculation

• Has undergone pelvic or prostate surgery

• Has neurological disease

• Has spinal cord injury

• Has diabetes

• Uses medications that can affect ejaculation

• Is trying to father a child

Distinguishing anejaculation from retrograde ejaculation

One important part of assessment is determining whether semen is failing to be produced or expelled, or whether it is entering the bladder.

A post-ejaculatory urine sample may be examined for sperm.

Significant numbers of sperm in urine after orgasm can support a diagnosis of retrograde ejaculation rather than true absence of seminal emission.

Physical examination

Clinical examination may include evaluation of:

• External genitalia

• Testes

• Penis

• Prostate when appropriate

• Neurological function

• Signs of peripheral neuropathy

• Secondary sexual characteristics

Laboratory testing

Depending on the clinical situation, testing may include:

• Semen analysis when an ejaculate can be obtained

• Post-ejaculatory urine analysis

• Testosterone

• LH

• FSH

• Prolactin

• Blood glucose or HbA1c

• Additional endocrine testing when indicated

Neurological evaluation

Men with known or suspected neurological disease may require further neurological assessment.

The level and completeness of spinal cord injury can strongly influence the ability to ejaculate and the likelihood of responding to assisted ejaculation techniques.

Fertility evaluation

When fertility is the primary concern, evaluation also focuses on determining whether sperm production is preserved.

If semen cannot be obtained naturally, assisted ejaculation or surgical sperm retrieval may be considered.