If you’re reading this, chances are you’ve experienced arousal at some point – but have you ever wondered how this happens in your body? Understanding sexual response from a biological and mechanical perspective can deepen your connection with your body and help you be gentler with yourself and others when things don’t always go as expected.
For a refresher on sexual anatomy, check out our detailed guide: Sexual Anatomy 101 (AFAB & AMAB).
Sexual Response for People with Vulvas (AFAB)
Sexual response models for people with vulvas have evolved over the years, with various approaches explaining arousal and orgasm. While these models differ, the core understanding remains that sexual arousal for those assigned female at birth (AFAB) involves both mental (cognitive and emotional) and physical processes.
How Arousal Happens
Arousal is triggered by different stimuli – touch, sound, sight, and even scent. These triggers activate the brain’s pleasure centres, increasing blood flow to the genitals. Here’s a closer look at the changes that occur:
- The vagina swells, and the labia minora (which contains erectile tissue) expands.
- Blood flow causes the vaginal walls to darken, while increased lubrication creates a sense of wetness.
- The clitoris enlarges, becoming highly sensitive. Direct stimulation may become uncomfortable, leading the clitoris to retract under the clitoral hood.
- Beyond the genitals, arousal can increase breathing rate, heart rate, and blood pressure. Muscle spasms may occur in the feet, face, and hands, along with heightened muscle tension.
Changes in the Vagina and Uterus
- The lower third of the vagina narrows slightly, while the upper two-thirds widens to create a ‘tenting’ effect.
- The Bartholin’s glands release fluid near the vaginal opening, enhancing lubrication.
- The uterus lifts as blood supply increases, causing breast tissue to swell and nipples to become erect.
Orgasm and Beyond
During orgasm, the pelvic floor contracts rhythmically between 3 to 15 times, lasting anywhere from 5 to 60 seconds. These contractions involve the vaginal platform, uterus, and anal sphincter. The release of oxytocin, often called the “love hormone,” brings feelings of relaxation and well-being.
The resolution phase follows, where:
- The clitoris descends.
- The vagina returns to its unaroused state.
- Engorgement of the labia and swelling subsides.
Unlike those with penises, people with vulvas don’t experience a refractory period after orgasm, meaning multiple orgasms are possible.
Why Do I Need Clitoral Stimulation to Orgasm?
It’s a common myth that vaginal penetration alone leads to orgasm. Research shows that most people with vulvas require clitoral stimulation to climax. However, some individuals can orgasm from penetration due to stimulation of the anterior vaginal wall, where the clitoris, urethral sponge, and Skene glands converge. This area is often referred to as the G-spot, and pressure on this region during penetration can induce orgasm – and sometimes even squirting.
What is Non-Concordance?
Non-concordance happens when the body’s physical response to arousal doesn’t match the brain’s perception of arousal. This is more common in AFAB bodies but can occur in AMAB bodies as well. Factors that may increase non-concordance include:
- Stress
- Burnout
- Fatigue
- Emotional disconnection
If non-concordance becomes distressing, sex therapy can help bridge the gap between mind and body. 
Sexual Response for People with Penises (AMAB)
Sexual arousal for people assigned male at birth (AMAB) involves three stages: erection, orgasm, and ejaculation. It’s important to note that orgasm and ejaculation are separate processes that don’t always occur simultaneously.
How Erections Happen
Erections occur due to a combination of mental, physical, and hormonal factors. The penis contains two chambers called the corpora cavernosa, which fill with blood during arousal.
- At Rest: Arteries supplying the penis remain partially open to maintain tissue health.
- During Arousal: Physical or mental stimulation triggers the brain to release hormones, fully opening the arteries.
- Sustained Erection: Blood becomes trapped in the corpora cavernosa, maintaining the erection until arousal subsides.
Nighttime Erections
Nighttime erections are an automatic reflex controlled by the spinal cord, occurring without conscious thought. These reflexes help maintain the health of erectile tissues by bringing fresh oxygenated blood to the area.
How Does Ejaculation Happen?
Ejaculation occurs in two phases:
- Emission Phase: The vas deferens contracts, pushing sperm toward the base of the penis. The prostate gland and seminal vesicles release secretions to create semen.
- Ejection Phase: Muscles at the base of the penis contract rhythmically, propelling semen out in spurts, typically at 0.8-second intervals.
Orgasm vs. Ejaculation
While orgasm and ejaculation often occur together, they are distinct processes. Orgasm is the peak of sexual arousal, marked by the release of sexual tension, while ejaculation involves the physical release of semen. Some people can orgasm without ejaculating, while others may ejaculate without experiencing orgasm.
Why Use ‘AMAB’ and ‘AFAB’?
Assigned sex at birth (ASAB) is the term used to describe the label assigned based on external anatomy at birth. While many use terms like “biological sex,” this phrase oversimplifies the complexity of sex and gender.
- AMAB (Assigned Male at Birth): Someone assigned male at birth based on external genitalia.
- AFAB (Assigned Female at Birth): Someone assigned female at birth based on external genitalia.
This terminology acknowledges that assigned sex may not align with a person’s gender identity or how they experience their body.
Founder and CEO of Cliterally The Best, Evie Plumb is a qualified sex educator and nearing the completion of her training in Psychosexual & Relationship Therapy. She’s on a mission to provide accessible, inclusive sex education for those of us who had a sh*tty sex ed – because when we truly understand our bodies and relationships, life is so much better (and, more importantly, way more fun!).
