Having sex can flavor our nights, and days, with sweet pleasure and excitement, relieving stress and worry. And, of course, sex has been key to ensuring that the human race lives on. In this article, we ask, “How does sex impact what happens in the brain?”
Sexual intercourse is known to impact the way in which the rest of our body functions.
Recent studies have shown that it can have an effect on how much we eat, and how well the heart functions.
As we have reported on Medical News Today, sex has been cited as an effective method of burning calories, with scientists noting that appetite is reduced in the aftermath.
Also, a study published in the Journal of Health and Social Behavior in 2016 found that women who have satisfying sex later in life might be better protected against the risk of high blood pressure.
Many of the effects of sex on the body are actually tied to the way in which this pastime influences brain activity and the release of hormones in the central nervous system.
Here, we explain what happens in the brain when we are sexually stimulated, and we look at how this activity can lead to changes in mood, metabolism, and the perception of pain.
Brain activity and sexual stimulation
For both men and women, sexual stimulation and satisfaction have been demonstrated to increase the activity of brain networks related to pain and emotional states, as well as to the reward system.
This led some researchers to liken sex to other stimulants from which we expect an instant “high,” such as drugs and alcohol.
The brain and penile stimulation
A 2005 studyTrusted Source by researchers at the University Medical Center Groningen in the Netherlands used positron emission tomography scans to monitor the cerebral blood flow of male participants while their genitals were being stimulated by their female partners.
The scans demonstrated that stimulating the erect penis increased blood flow in the posterior insula and the secondary somatosensory cortex in the right hemisphere of the brain, while decreasing it in the right amygdala.
The insulaTrusted Source is a part of the brain that has been tied to processing emotions, as well as to sensations of pain and warmth. Similarly, the secondary somatosensory cortexTrusted Source is thought to play an important role in encoding sensations of pain.
As for the amygdala, it is known to be involved in the regulation of emotions, and dysregulations of its activityTrusted Source have been tied to the development of anxiety disorders.
An older study from the same university — which focused on brain regions that were activated at the time of ejaculation — found that there was an increase in blood flow to the cerebellum, which also plays a key role in the processing of emotions.
The researchers liken the activation of the cerebellum during ejaculation to the pleasure rush caused by other activities that stimulate the brain’s reward system.
“Our results correspond with reports of cerebellar activation during heroin rush, sexual arousal, listening to pleasurable music, and monetary reward.”
The brain and the female orgasm
In a study of the female orgasm that was conducted last year, scientists from Rutgers University in Newark, NJ, monitored the brain activity of 10 female participants as they achieved the peak of their pleasure — either by self-stimulation or by being stimulated by their partners.
The regions that were “significantly activated” during orgasm, the team found, included part of the prefrontal cortex, the orbitofrontal cortex, the insula, the cingulate gyrus, and the cerebellum.
These brain regions are variously involved in the processing of emotions and sensations of pain, as well as in the regulation of some metabolic processes and decision-making.
Another study previously covered on MNT suggested that the rhythmic and pleasurable stimulation associated with orgasm puts the brain in a trance-like state. Study author Adam Safron compares the effect of female orgasms on the brain to that induced by dancing or listening to music.
“Music and dance may be the only things that come close to sexual interaction in their power to entrain neural rhythms and produce sensory absorption and trance,” he writes.
“That is,” he adds, “the reasons we enjoy sexual experiences may overlap heavily with the reasons we enjoy musical experience, both in terms of proximate (i.e. neural entrainment and induction of trance-like states) and ultimate (i.e. mate choice and bonding) levels of causation.”
Sex and hormonal activity
So what does this all mean? In essence, it means that sex can impact our mood — normally for the better, but sometimes for the worse.