Vascular function and sexual response
The vascular basis of sexual response
Key takeaway for patientsSexual function depends on healthy blood vessels. A change is worth mentioning to a physician, because the causes are often general health conditions that can be addressed.
Arousal is, physically, a vascular event. Nerve signals cause the endothelium, the lining of the blood vessels, to release nitric oxide, which relaxes smooth muscle and lets blood flow into genital tissue, in men and in women.
Because this depends on healthy small vessels, a change in sexual function can be an early sign of vascular or metabolic disease. In men, erectile difficulty is recognized as a marker of cardiovascular risk.
Key steps in the vascular response
- Stimulus
- Psychological or physical stimulation activates the parasympathetic nerves.
- Nitric oxide release
- From nerve endings and from the endothelium.
- Smooth muscle relaxation
- Vessels widen and the tissue fills with blood.
- Resolution
- Sympathetic activity returns the tissue to rest.
Factors that impair the vascular response
The causes are usually shared with general vascular health:
- Vascular risk factors
- High blood pressure, diabetes, raised cholesterol and smoking.
- Hormonal change
- Low testosterone, or the menopause.
- Medicines
- Some affect blood flow or nerve signaling.
- Stress, anxiety and low mood
- Suppress the nerve signals that start the response.
Clinical management and physician guidance
A change in sexual function is assessed as a question of general health.
- Cardiometabolic and hormonal assessment
- Blood pressure, glucose, lipids and hormone levels.
- Physician-guided care
- Managing vascular risk and any contributing cause, as your physician decides.
- Monitoring and follow-up
- Symptoms and markers are reviewed over time, and the plan is adjusted to them.
Research focus in vascular sexual physiology
| Core focus area | Biological target | Clinical relevance |
|---|---|---|
| Endothelial function | Endothelial nitric oxide synthase | Widening of blood vessels |
| Smooth muscle | Tone of vascular smooth muscle | Filling of genital tissue |
| Neural control | Autonomic nerves | Initiation of arousal |
| Cardiovascular risk | Small-vessel disease | Sexual function as an early marker |
Frequently asked questions
- Why is sexual function linked to heart health?
- Both depend on the lining of the blood vessels, and small vessels are often affected first.
- Can stress alone affect it?
- Yes. Arousal needs the parasympathetic nervous system, which stress suppresses.
- Is it appropriate to raise this with a physician?
- Yes. It is a common and medically relevant concern, and consultations are confidential.
Academic references and literature
- Burnett AL et al. (1992). Nitric oxide: a physiologic mediator of penile erection. Science, 257(5068), 401-3. PMID 1378650.
- Thompson IM et al. (2005). Erectile dysfunction and subsequent cardiovascular disease. JAMA, 294(23), 2996-3002. PMID 16414947.
- Gandaglia G et al. (2014). A systematic review of the association between erectile dysfunction and cardiovascular disease. Eur Urol, 65(5), 968-78. PMID 24011423.
This guide belongs to the Sexual Health program