The bulbospongiosus (BS) muscle surrounds the bulb of the penis and the urethra. During orgasm, it contracts rhythmically to propel seminal fluid through the urethra — making it a key pelvic floor muscle in men's sexual health and erectile dysfunction rehabilitation. Its strength and rhythm determines ejaculatory force, volume expelled per contraction, and orgasm intensity.
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Effects of BS Muscle Weakness
- •Reduced ejaculatory force — fluid 'dribbles' rather than projecting
- •Reduced semen volume per contraction
- •Less subjectively intense orgasm
- •Longer post-ejaculatory refractory period
- •In severe cases: retrograde ejaculation (fluid goes backward into bladder)
BS Hypertonicity and Premature Ejaculation
A chronically tightened (hypertonic) bulbospongiosus may contribute to premature ejaculation through two mechanisms: baseline tension reduces the threshold for ejaculatory reflex triggering, and chronic muscle tension heightens perineal sensitivity. The treatment in this case is paradoxical — not strengthening exercises but relaxation training and reverse kegels, which reduce resting muscle tone.
How to Train the Bulbospongiosus
The BS muscle is activated by the perineal contraction — different from the IC muscle. To locate it: contract as if trying to stop urination but focus on the area between the scrotum and anus rather than the urethral sphincter directly.
- •Slow contractions: 10-second holds, full relaxation between each, 10 repetitions, 3 sets
- •Quick contractions: 20 rapid contractions in succession — train the fast-twitch fibres responsible for ejaculatory rhythm
- •Progressive overload: Increase hold time by 2 seconds every 2 weeks
- •Frequency: 3 sessions per week on non-consecutive days
Pelvic floor strength improvements take consistent training over weeks to months. ManCore's daily symptom log helps you track the secondary markers — energy, mood, sleep quality — that move together with pelvic floor health.
More in the Pelvic Floor & Erectile Mechanics Hub
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Reverse Kegels for Premature Ejaculation
How to relax rather than strengthen pelvic muscles when hypertonicity is the problem.
How Long Until Pelvic Floor Results?
The evidence-based timeline for improvement at each training phase.
Frequently Asked Questions
Can pelvic floor training cure premature ejaculation?
For men with lifelong premature ejaculation: pelvic floor training (specifically reverse kegels for BS relaxation combined with stop-start technique) has shown improvement in small studies; in one early study of pelvic floor rehabilitation, 11 of 18 men (61%) gained ejaculatory control after 15–20 sessions [1]. For acquired premature ejaculation with identified BS hypertonicity: results are better. It is not a universal cure but is a first-line non-pharmacological intervention.
Does ejaculatory force decline with age?
Yes — BS muscle strength declines with age like all skeletal muscle. Studies show a meaningful decline in ejaculatory force from the 40s onward. Regular training significantly slows this decline. Men who maintain pelvic floor training into their 60s and 70s show substantially better ejaculatory function than age-matched sedentary men.
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The Ejaculation Mechanism: How the Bulbospongiosus Drives Orgasm
Ejaculation involves two distinct phases: emission and expulsion. During emission, semen moves from the vas deferens into the posterior urethra — a process controlled by the sympathetic nervous system. During expulsion, the bulbospongiosus (BS) muscle contracts rhythmically — typically 3–8 contractions at 0.8-second intervals — generating the pressure that forcibly expels semen. These contractions are what create the subjective sensation of orgasm. The strength and number of contractions directly determines ejaculation force and subjective intensity.
Why Bulbospongiosus Weakness Causes Sexual Dysfunction
A weak or poorly recruited BS muscle creates a recognizable cluster of symptoms that men rarely connect to their pelvic floor: reduced ejaculation force, dribbling rather than projectile ejaculation, muted orgasm intensity, difficulty maintaining erection firmness during penetration, and post-ejaculatory urinary dribble. Studies using electromyography (EMG) show that men with these symptoms consistently show reduced BS activation amplitude compared to asymptomatic controls, confirming the muscular — not purely psychological — origin of many of these complaints.
- •Reduced ejaculation force — often described as 'dribbling' rather than expulsion
- •Muted orgasm intensity — fewer perceived contractions
- •Post-ejaculatory urinary dribble — incomplete urethral clearance
- •Weak erection base — BS also compresses deep penile veins during erection
- •Premature ejaculation — paradoxically, poor BS control reduces ejaculatory reflex timing
How to Train the Bulbospongiosus: Targeted Exercise Protocol
The BS muscle is best isolated using the 'base clench' — contracting specifically at the penile root and base of the scrotum, rather than the anus or general pelvic floor. Place two fingers at the perineum midpoint during contraction: you should feel a distinct pulse or tightening directly at the base. If you feel only anal contraction, you are recruiting the wrong muscle. EMG biofeedback devices can confirm correct activation. Most men require a few weeks of practice before reliably isolating the BS independently from the anal sphincter.
- •Find the muscle: Stop urine midstream briefly — the muscle that creates this sensation is your BS
- •Beginner: 3 sets of 10 short contractions (2-second hold, 2-second release) daily
- •Intermediate: Add 8-second sustained holds — 3 sets of 5 reps
- •Advanced: Rapid-fire contractions (1-second on/off) — 3 sets of 15
- •Integration: Practice during arousal to build ejaculatory control under real conditions
Bulbospongiosus and Premature Ejaculation
The relationship between BS muscle function and premature ejaculation (PE) is complex: both hypertonic (overactive) and hypotonic (underactive) BS muscles are found in men with PE, via different mechanisms. In hypertonic PE, the muscle is perpetually over-contracted and requires minimal stimulation to trigger ejaculation reflex. In hypotonic PE, poor sensory feedback and control reduce the man's ability to modulate arousal at the point-of-no-return. Pelvic floor physical therapy distinguishes between these two types through assessment, providing either release techniques or strengthening protocols accordingly.
Pelvic floor physiotherapists now treat PE routinely — studies show most men achieve significant improvement in intravaginal ejaculatory latency time (IELT) after about 12 weeks of targeted pelvic floor training, often without medication.
How Long Until Results Are Noticeable?
Men performing consistent BS training typically notice improvements in ejaculation force and orgasm intensity within 6-10 weeks. Premature ejaculation improvement, measured by intravaginal ejaculatory latency time (IELT), typically shows a measurable increase within a few months. A 2019 study in Therapeutic Advances in Urology found that 12 weeks of pelvic floor training increased mean IELT from 1.2 to 3.8 minutes — a clinically meaningful improvement without pharmaceutical side effects. Gains plateau at approximately 6 months, after which maintenance training (3×/week) sustains results.
Frequently Asked Questions
Can I train the bulbospongiosus after prostate surgery?
Yes — and it's often specifically recommended post-prostatectomy. Radical prostatectomy damages the bulbospongiosus nerve supply in some men, contributing to post-surgical ejaculatory changes and urinary incontinence. Pelvic floor rehabilitation started early after surgery improves the speed of continence recovery. Consult your surgeon before starting, but most recommend beginning pelvic floor exercises as soon as the catheter is removed. A pelvic floor physiotherapist can tailor the protocol to your surgical approach.
Is the bulbospongiosus the same as the PC muscle?
No — they are distinct muscles. The pubococcygeus (PC) muscle is the large pelvic floor muscle targeted by standard Kegel exercises; it spans the pelvic bowl and primarily provides pelvic organ support. The bulbospongiosus is a smaller, specialized muscle wrapped around the base of the penis and bulb of the urethra. Generic Kegel exercises target the PC; the 'base clench' targets the BS. Both contribute to sexual function, but for ejaculatory force and control, the BS is the primary target.
What is the fastest way to strengthen the bulbospongiosus?
Combined training — alternating between slow, sustained holds (8-10 seconds) and rapid-fire contractions (1-second intervals) — produces the fastest strength gains because it trains both slow-twitch and fast-twitch muscle fibers. The fast-twitch fibers are specifically responsible for the expulsion contractions during ejaculation. Training 5 days per week with rest days produces measurably faster strength gains than daily training, as muscle repair occurs during recovery periods.
The Bulbospongiosus and Urinary Control
Beyond ejaculation, the bulbospongiosus plays an underappreciated role in urinary continence — specifically in men who experience post-void dribble (terminal dribble of urine after leaving the toilet). The BS muscle wraps around the bulbar urethra; after voiding, a properly functioning BS contracts to expel the last few milliliters of urine trapped in this section of urethra. When the BS is weak, this urine is not expelled at the toilet — it dribbles out minutes later, dampening underwear. This is why pelvic floor physiotherapy protocols for post-void dribble specifically target BS strengthening alongside the urethral milking maneuver, which often improves symptoms over weeks of consistent practice.
Frequently Asked Questions
Does the bulbospongiosus muscle weaken after prostate cancer treatment?
Yes — both radical prostatectomy and pelvic radiation can damage bulbospongiosus function through direct muscle or nerve disruption. Post-prostatectomy, the nerve supply to the BS may be partially disrupted depending on surgical approach (nerve-sparing vs. non-nerve-sparing). This contributes to post-surgical urinary incontinence, reduced ejaculatory function (most men do not ejaculate after radical prostatectomy due to removal of seminal vesicles), and may contribute to climacturia (urine leakage during orgasm). Pelvic floor rehabilitation started early after surgery tends to accelerate continence recovery by rehabilitating remaining BS function.
Can I train the bulbospongiosus while sitting at a desk?
Yes — the BS 'base clench' is nearly invisible and can be performed during any seated activity. The movement involves a brief, firm contraction at the base of the penis and perineum without moving the legs, buttocks, or abdomen. Most colleagues would be completely unaware. The challenge is identifying the right muscle vs. inadvertent gluteal or abdominal bracing. Once isolated (usually after 1-2 weeks of practice), you can incorporate 3-4 sets of 10 contractions throughout the workday — while at a desk, in a car, or watching television — making the time investment minimal.
Do age-related changes in the bulbospongiosus affect sexual function?
Yes — peak BS muscle mass and contractile speed occur in the mid-20s and decline gradually thereafter. By age 50-60, many men notice reduced ejaculation force and orgasm intensity that is partially attributable to BS atrophy and slowed neuromuscular conduction. Testosterone decline accelerates this process, since testosterone is required for skeletal muscle protein synthesis. Consistent pelvic floor training throughout midlife significantly attenuates this decline — men who maintain training show substantially better ejaculatory function into their 60s and 70s compared to sedentary age-matched controls. The muscle responds to progressive overload at any age, though hypertrophy occurs more slowly after 50. For men over 60 beginning pelvic floor training for the first time, a starting program of 3 sessions per week with longer rest intervals between sets typically produces better results than the 5-day programs designed for younger men with faster recovery capacity.