Once the male knows he has a fertile female in front of him, he sort of follows her around trying to mount her for a couple of days, often while sporting a frankly alarming erection, and sometimes licking her hind legs.

That’s due to a surge in sex hormones, particularly testosterone, which can help improve concentration and reaction times.

The scans show that, during sex, the parts of the female brain responsible for processing fear, anxiety and emotion start to relax more and more, reaching a peak at orgasm, when the female brain’s anxiety and emotion are effectively closed down.

The important thing to remember is that the researchers initially thought that the homosexual matings were a dominance thing—one male trying to assert his role over another.

But the male giraffes who were being mounted didn’t display any signs of submission the way lady giraffes do, which means it’s probably just sex for sex's sake.

‘In fact, this accounts for 75 per cent of heart-related deaths from sex, 90 per cent of which are older men.

It’s thought the combination of high-fat foods and alcohol — wining and dining — combined with vigorous exercise, often with a younger partner, is what tends to trigger the heart event.’Researchers at Nottingham University have found that men who enjoy a regular sex life in their 50s are at lower risk of developing prostate cancer.However, the problem is that the body can’t distinguish whether the person we’re with is a casual fling or marriage material — 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.After orgasm, a hormone called oxytocin is released which helps people bond and trust each other.But it is also the reason why people feel so miserable when a short-term relationship ends (file photo) If you’re struggling to nod off, it’s better to have sex than take a sleeping pill, Dr Ghosh said.Once the male rears up on his hind legs and mounts her successfully, he ejaculated in mere seconds.