The blog of Xeno, a slightly mad scientist
Images: Scientists have used brain scan images to record the world’s first video of the female brain as it approaches, experiences and recovers from an orgasm. The animation reveals the steady buildup of activity in the brain as disparate regions flicker into life and then come together in a crescendo of activity before gently settling back down again. – link
Arguably, unraveling the mystery of whether vaginal orgasms exist should be simple: Ask women if they have them. But in practice, it’s a bit harder to tease out the exact sexual stimulation that leads to orgasm.
French gynecologist Odile Buisson argues in her Journal of Sexual Medicine essay, for example, that the front wall of the vagina is inextricably linked with the internal parts of the clitoris; stimulating the vagina without activating the clitoris may be next to impossible. Thus, “vaginal” orgasms could be clitoral orgasms by another name.
Other research, however, would tend to suggest two distinct types of female orgasm. Barry Komisaruk of Rutgers University has conducted multiple studies in which women masturbate while having their brains scanned with a functional magnetic resonance imaging (fMRI) machine. The results show which sensory brain areas activate in response to stimulation.
“If the vagina stimulation is simply working via clitoral stimulations, then vaginal stimulation and clitoral stimulation should activate the exact same place in the sensory cortex,” Komisaruk told LiveScience. “But they don’t.”
In fact, Komisaruk reports in the journal, the brain areas for clitoral, cervical and vaginal stimulation cluster together but only overlap slightly, like a “cluster of grapes.”
And then there is other evidence for multiple types of orgasms: Women report that vaginal and clitoral orgasms feel different. Women with spinal cord injury that cuts off all communication between the clitoris and the brain can still have orgasms with vaginal stimulation. Some lucky ladies can even “think” themselves to orgasm with no stimulation at all. (There are also reports of women orgasming from tough abdominal workouts at the gym.)
“[O]rgasm in women is in the brain, it is felt in many body regions, and it can be stimulated from many body regions as well as from imagery alone,” wrote Rutgers University professor emerita Beverly Whipple, one of the discovers of the also-controversial “G-spot,” an area on the front vaginal wall that may be particularly sensitive to sexual stimulation.
The meaning of an orgasm
If the origin of the orgasm is controversial, so, too, is the purpose of this reflex. Whipple’s research has suggested that the sensitive G-spot has a pain-blocking function during labor; when the baby’s head is stretching out the vaginal walls, it might be advantageous to have a little relief. Her studies have found that when pressure is applied to the G-spot, a woman’s pain threshold shoots up 47 percent. In other words, it takes a lot more pain before the woman says “ouch.”
If the G-spot stimulation is pleasurable, Whipple and her colleagues found, the pain threshold increases by 84 percent compared with no stimulation, and during orgasm, that threshold hits a whopping 107 percent.
Most provocatively, some research links vaginal-only orgasms with both physical and mental health.
For instance, one study found women who have vaginal orgasms have a lower resting heart rate than those who don’t. Other research has found women who orgasm without clitoral stimulation are less likely on average to use certain maladaptive psychological coping mechanisms, said Stuart Brody, a psychologist at the University of West Scotland who has conducted this research. Among these mechanisms are somatization (psychological symptoms manifesting as physical complaints), displacement (displacing an emotion about one person or object onto another), and isolation of affect (disconnecting emotions from experiences).
“Impairment of specifically vaginal orgasm is associated with a variety of other psychological impairments,” Brody told LiveScience. The findings aren’t meant as a value judgment on women who don’t experience vaginal orgasms, he said. But given that some research suggests teaching women that orgasms originate only with the clitoris results in fewer vaginal-only orgasms, Brody argues that this kind of anti-vaginal sex advice could count as “malpractice.” …