Sex is one of our biggest preoccupations — causing thrills, heartache and downright confusion. But until recently, exactly what happens in the brain during sex was something of a mystery to scientists.

The bible agrees,

…And the two will become one flesh. This is a profound mystery… Ephesians 5:31-32  (NIV)

Now, however, American researchers have uncovered some of what goes on.

Bonding Agents

A key hormone released during sex is oxytocin, also known as the ‘cuddle hormone’. This lowers our defenses and makes us trust people more.   It’s also the key to bonding, as it increases levels of empathy. Women produce more of this hormone, although it’s not clear why, and this means they are more likely to let their guard down and fall in love with a man after sex.

However, the problem is that the body can’t distinguish whether the person we’re with is a casual fling or your marriage partner — oxytocin is released either way. So while it might help you bond with the love of your life, it’s also the reason you may feel so miserable when a short-term relationship ends.

In men, more dopamine is released — the pleasure hormone.  And this surge can be addictive,’ says Dr Ghosh.   That’s why so many more men tend to suffer from sex addiction.

More Brain Activity

The scientists from Rutgers University, New Jersey, found that up to 30 different parts of the brain are activated, including those responsible for emotion, touch, joy, satisfaction and memory.

There is a known circuit in the brain that’s involved in feeling happy,’ explains Paul Thompson, professor of neurology at the University of California, Los Angeles, and an expert in brain imaging.

‘This is called the limbic region, which is deep in the brain, and it’s more active when we’re rewarded.  ‘During sex there’s more blood flow to the head, more neurons firing, more brain activity.

‘Much of this deep brain circuit runs on the hormone dopamine. Anything pleasurable tends to cause these brain cells to exude more of it and this makes them fire faster.’

‘Without doubt, sex has not only physical but psychological and social benefits, too,’ says Dr Ghosh.

New Brain Cells and Less Dementia

Many of us are all too aware that our brain cells decline with age. In fact, it’s said we lose 7,000 brain cells a day by the time we’re 35, which makes rather depressing reading.

The good news, however, is that having regular sex may help us grow new brain cells, according to scientists from Princeton University in the United States.

And the more sex you have, the more cells you can grow, it seems. Animal studies, published in the journal PLoS ONE, suggest that sex stimulates the growth of brain cells in the hippocampus, the part of the brain responsible for memory and learning.

Factors such as stress and depression have been shown to shrink the hippocampus, yet exercise and sex counteract this effect.

Furthermore, sex could actually be protecting our brain cells against decline.

‘There is some evidence that older people who are sexually active are less likely to have dementia and this could be for a variety of complex reasons,’ says Dr Ghosh.

Sex causes increased blood flow to the brain, which improves oxygen levels.

‘MRI scans have shown that during orgasm the neurons in the brain are more active and use more oxygen,’ explains Barry Komisaruk, professor of psychology at Rutgers University and a leading authority on sex and neuroscience.

‘It appears that the more active the neurons, the more oxygen they withdraw from the blood — so more oxygenated blood is supplied to the region, delivering a fresh supply of nutrients.’

But as well as boosting brain cells, sex could also sharpen a woman’s mind, says Dr Ghosh. That’s due to a surge in sex hormones, particularly testosterone, which can help improve concentration and reaction times.

Less Depression

‘The endorphins released during sex can really help treat depression and clear the mind.

‘One is serotonin, also called the happy hormone, which creates a sense of bliss. People often say that sex is the last thing they feel like doing when they’re depressed, but do try it if you can.

‘And don’t worry if you get emotional afterwards.. This is caused by a combination of endorphins being released and heightened emotions.’

A Natural Painkiller

Orgasm can block pain signals, says Professor Komisaruk. Research using laboratory animals and humans has found that orgasm can inhibit the release of pain transmitters from the spinal cord so they can’t reach the neurons in the brain that respond to pain.

In fact, he says, it can raise the pain threshold so much that the equivalent effect in morphine is three times the usual pain-relieving dose.

But experts say that for many people — especially women — the mind plays a key role in achieving orgasm.

Better Sleep

If you’re struggling to nod off, it’s better to have sex than take a sleeping pill, says Dr Ghosh.

‘In fact, it’s more beneficial to have sex in the evening rather than the morning because the body wants to be relaxed afterwards, not get up and go to work.

‘By having sex at the end of the day you’ll reap more of the stress-relieving benefits.  For a man, a powerful orgasm is the equivalent of having on average a 2-3mg shot of diazepam (or Valium).

‘That’s why so many men nod off afterwards — there really is a biological reason for this.’

Smooching Means Better Sex

You’ll have much better sex if you kiss before intercourse.  The lips are packed with nerve endings — 100 times more than the fingertips.

As a result, kissing kick-starts multiple mechanisms in the brain, releasing chemicals that lower stress and boost mood, says Dr Ghosh.

It increases levels of the pleasure hormones and will make you a lot more receptive to what happens later.

‘That’s why loving sex can be more satisfying than a quickie — and that endorphin hit from dopamine is especially important for women.’

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 Adapted from : http://www.dailymail.co.uk/health/article-2031498/Sex-Why-makes-women-fall-love–just-makes-men-want-MORE.html#ixzz2snAYC3uD