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More recent research has focused on the hormones dehydroepiandrostone (DHEA) and testosterone, both important for libido. They have been linked to reducing the risk of heart disease as well as protecting the heart muscle after an attack. That may explain why doctors maintain that sex after a heart attack is relatively safe...
...mechanism that generates the template of what we find attractive." The next time you see your partner or someone like your partner, he theorizes, "the oxytocin is activated. It doesn't mean you have to be aroused. You just think, God, what a beautiful woman"--which might explain why we're attracted to the same type over and over...
...switch for female arousal, and stumbled upon one of oxytocin's more potent effects: its ability to dull pain. Whipple showed that gentle pressure on the G spot raised pain thresholds by 40% and that during orgasm women could tolerate up to 110% more pain. But she could not explain the link until the advent of functional magnetic resonance imaging (fMRI). Using fMRI to view the brains of easily orgasmic women as they climaxed, either with visual stimuli or by self-stimulation, Whipple found that the body's pain-killing center in the midbrain is activated during peak arousal. Signals...
...that doesn't explain why people do it--a question that sexologists can't yet answer. "Tell me the etiology of heterosexuality or homosexuality," says Moser, "and I will tell you the etiology of SM." Federoff has compiled new online surveys from 2,000 women and 2,000 men who identified themselves as part of the BDSM scene. "We have only started to analyze the data," he says, "but the first impression is that the people we have looked at tend to look very much like regular people from all walks of life--that is, they tend to look like...
...serotonin. I also knew these three compounds were much more prevalent in some brain regions than in others. If I could establish which regions of the brain become active while one is feeling romantic rapture, that might confirm which primary chemicals are involved. Perhaps these data would help explain the evolutionary roots of romantic love, why we choose one person rather than another, even how people can find and sustain this glorious passion...