Sexual arousal explained: what happens in your brain and body?

The latest episode explores sexual arousal, explaining how the brain, body and desire work together before and during sex.

What actually happens when you become sexually aroused? Is it purely physical, or does your brain play an equally important role? In the fourth episode of the Local Sex Shop, hosts Mikaella and Maja are joined by clinical psychology master’s student Vera to unpack the science behind sexual arousal.

Vera studies clinical psychology and is currently involved in research where sexual arousal plays a central role. Drawing from both academic literature and her own research experience, she explains that sexual arousal is both a physiological and psychological state. Increased heart rate, greater blood flow to the genitals and heightened sensitivity are all part of the body’s preparation for intimacy, while the brain determines whether a situation is interpreted as sexually relevant.

The episode explores the role of different brain regions involved in arousal, including the amygdala, hypothalamus and prefrontal cortex. Memory also plays a role, as previous experiences help shape what people perceive as sexually stimulating, often without conscious awareness.

One of the central themes is the distinction between sexual arousal and sexual desire. Although the two often occur together, they are not the same. Someone may physically experience arousal without wanting to have sex, while another person may feel the desire for intimacy without their body responding in the expected way. According to the hosts, understanding that distinction can help explain why sexual experiences differ so widely between individuals.

The conversation also touches on physical versus subjective arousal. Vera explains that the body’s automatic responses do not always reflect someone’s thoughts or wishes. This is particularly important when discussing sexual assault, where physical responses such as lubrication can occur even when someone does not consent or experience pleasure. Rather than signalling enjoyment, these responses are understood as automatic protective mechanisms of the body.

The hosts also discuss factors that can interfere with sexual arousal. Stress, relationship difficulties, worries about sexual performance and negative emotions can all make it more difficult to become aroused. These factors may contribute to sexual dysfunctions such as erectile dysfunction, orgasmic disorders or vaginismus, although Vera stresses that these conditions are only diagnosed when they persist over time and significantly affect someone’s wellbeing.

Throughout the episode, Mikaella and Maja also reflect on how much remains unknown. Research into female sexual function, they note, still lags behind research involving men, making it difficult to draw firm conclusions about some commonly repeated claims regarding differences in arousal between men and women.

The episode ends with a preview of part two, in which Vera will dive deeper into her own research on the relationship between sexual arousal and disgust.