Everyone’s fairly interested in sex, including scientists. If you’ve ever wondered what sex looks like via an ultrasound scanner, or you’ve pondered about how much sex you need to be happy, science has got you covered.

A team of researchers from the Mayo Clinic and the Indiana University School of Medicine have investigated why some people find it difficult to achieve orgasm, and they’ve found that it’s not all in the mind. For men, reaching the proverbial peak is strongly controlled by a feedback loop in their nervous system, whereas women’s ability to climax is largely determined by the position they prefer during sex.

The new study, published in the journal Clinical Anatomy, looked at a range of previous studies in an attempt to clarify the links between sexual anatomy and the ability to orgasm. Some of the studies included magnetic resonance imaging (MRI) scans of couples copulating, which provided information as to which sexual positions were the most likely to culminate in an orgasm.

When it comes to men, the performance of their penis came down to something called a reflex loop. As with any sense, the physical stimuli experienced by the penis are processed in both the brain and the spinal cord. This information helps the central nervous system then instruct the penis on how to proceed in a continual feedback loop. This loop is influenced not just by physical stimuli, but also psychological stimuli, such as explicit imagery of the object of their attraction.http://www.goreadus.com/health/heres-why-you-cant-orgasm-according-to-science/

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