Established physiology.
Assembled properly.

Stress mediators are adaptive in the moment and damaging when chronically engaged, producing measurable physiological change over time, which is the basis of allostatic load theory.

This is why the model is built as a balance rather than a score, and why it watches trajectory rather than snapshots. A person in the compensating state usually looks fine on any single day. The information is in the direction, not the reading.

Nitric oxide produced by the endothelium is a principal mediator of genital blood flow; the vascular response is sustained by shear-stress-driven signalling, and reduced nitric-oxide availability is associated with arousal difficulty.

The clinical consequence is what matters to a reader: erectile dysfunction can precede clinically evident cardiovascular disease. New or unexplained ED, particularly in younger men or in diabetes, should trigger cardiovascular-risk assessment. It deserves a heart conversation, not just a prescription.

Oxytocin signalling is a well-characterised modulator of pair-bonding, partner preference and social attachment. That grounds attachment safety as a measurable contributor rather than a sentiment.

And here is the line. No marker of this may be read as a verdict on trust, fidelity, attachment style, promiscuity or compatibility. The findings are not remotely deterministic enough for those uses, the temptation to use them that way is commercially obvious, and we refuse it explicitly.

Serotonergic tone modulates orgasm and desire, which is why sexual side-effects are so common with serotonergic antidepressants. Other agents work through prolactin, androgen availability or sedation. Different mechanisms, different timelines, different answers.

Individual variation in how a person processes a given medicine can influence exposure and tolerability, which is context worth having when a conversation with a prescriber happens. It does not predict whether sexual difficulty will occur, and we present it as context rather than prophecy. The decision is always the clinician's.

Hormonal life stage strongly modulates capacity, so the model applies phase-aware expectations rather than uniform ranges. This lets phase-typical variation be distinguished from genuine drift.

It matters most where people are dismissed most. Genitourinary syndrome of menopause, which brings dryness, painful sex, urinary urgency and recurrent infections, is common, treatable and routinely written off as an inevitability of ageing. Postpartum discomfort, long-relationship responsive desire and medication-induced orgasm difficulty are three different things and must never receive the same explanation.

Genital arousal, subjective arousal, desire, pleasure, consent, satisfaction and orgasm are separate phenomena that frequently move independently. Lubrication or erection does not establish consent. Orgasm can occur during an unwanted experience. Consensual activity can be unpleasant. A good experience needn't include orgasm at all.

Collapsing these is the source of an enormous amount of harm in clinics, in courtrooms and in bedrooms. Keeping them separate is the foundation of clinical accuracy and of trauma-informed care. And responsive desire is never an obligation to begin unwanted activity and wait for wanting to show up. Consent stays active and reversible throughout.