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    In men and women sexual arousal culminates in orgasm, with female orgasm solely from sexual intercourse often regarded as a unique feature of human sexuality. However, orgasm from sexual intercourse occurs more reliably in men than in women likely reflecting the different types of physical stimulation men and women require for orgasm. In men, orgasms are under strong selective pressure as orgasms are coupled with ejaculation and thus contribute to male reproductive success. By contrast, women's orgasms in intercourse are highly variable and are under little selective pressure as they are not a reproductive necessity.. The proximal mechanisms producing variability in women's orgasms are little understood.
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    Sex on the brain: Orgasms unlock altered consciousness

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    Yes, Yes, Yes: the techniques that boost chances of female orgasm

    By Kayt Sukel. Brain stimulation. Our intrepid reporter performs an intimate act in an fMRI scanner to explore the pathways of pleasure and pain. WITH a click and a whirr, I am pulled into the scanner. My head is strapped down and I have been draped with a blanket so that I may touch my nether regions — my clitoris in particular — with a certain degree of modesty. I am here neither for a medical procedure nor an adult movie. Rather, I am about to stimulate myself to orgasm while an fMRI scanner tracks the blood flow in my brain.
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    The ins and outs of the vagina

    The secret to female orgasm? The female orgasm has often been described as elusive, but researchers say they might have discovered how to boost the chances of eliciting the yes, yes, yes. Published in the journal Archives of Sexual Behavior , a team of US researchers analysed data collected through an online survey, hosted on the NBC News website, based on responses from more than 52, participants aged between 18 and 65 who were in a relationship with one person. While 95 per cent of heterosexual men reporting that they usually or always orgasmed during sexually intimate moments, just 65 per cent of heterosexual women did. By contrast, the figure was 89 per cent for gay men, 86 per cent for lesbian women, 88 per cent for bisexual men and 66 per cent for bisexual women.
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    Orgasm is one of the most intense pleasures attainable to an organism, yet its underlying mechanisms remain poorly understood. On the basis of existing literatures, this article introduces a novel mechanistic model of sexual stimulation and orgasm. In doing so, it characterizes the neurophenomenology of sexual trance and climax, describes parallels in dynamics between orgasms and seizures, speculates on possible evolutionary origins of sex differences in orgasmic responding, and proposes avenues for future experimentation. Here, a model is introduced wherein sexual stimulation induces entrainment of coupling mechanical and neuronal oscillatory systems, thus creating synchronized functional networks within which multiple positive feedback processes intersect synergistically to contribute to sexual experience.
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