People say true love lasts for ever but not according to scientists' research.

They showed that the intoxicant which causes your head to spin when you first fall in love with someone actually has its useful life. They also say that the chemical which causes this, lives for only 12 months before it fades away!

A research was conducted on men and women between the ages of 18 to 31, some of them had just fallen in love, some already in a long term relationship and others were single.

Among those in the first group, these scientist showed that levels of protein called Nerve Growth Factor- which causes those telltale palpitations, sweaty palms and butterflies in the stomach.

But in couples who had been together for a year or more, the levels had fallen back to that found in singletons.

Quoting Dr. Enzo Emanuele, who led the study at the University of Pavia in Italy, said "We have demonstrated for the first time that circulating levels of NGF are elevated among subjects in love, suggesting an important role for this molecule in the social chemistry of human beings.

Potential participants are required to be truly, deeply and madly in love. The raised NGF levels when falling in love could be related to specific emotions typically associated with intense early stage romantic love, such as emotional dependency and euphoria.

The specificity of NGF increase during early stage love seems to suggest that it could be involved in the formation of novel bonds, whereas it does not appear to play a major role in their maintenance".

The volunteers being studied by these researchers were asked to spend at least four hours a day thinking about their lover whom they've being involved with for six months.

Tests showed that both men and women who had recently fallen in love had very high levels of NGF-227 units, compared with 123 units recorded in those in long-standing relationships.

Those who reported the most intense feelings also had the highest NGF levels.

But when researchers revisited couples from the "in love" group who were still in the same relationship more than a year later, they found that levels of NGF had declined to the same as those who were single or in a long-term relationship.

The team believe that NGF plays an important part in the release of another chemical responsible for social bonding.

So while passion dies, the same chemical stimulates companionship essential in any long-term relationship.

But you should know that there are now ways to stimulate this so called NGF, because in order to have a sexy and spiced up love life, you need to Recreate that original feeling.

Never think that because you've being in a relationship for more than a year, it gives you the liberty to relax without spicing it up. You'll definitely fail and loose your lover. I don't think you would consider that as an option, or would you?

Learn to recreate your sex life, make the best out of your relationship and live in an atmosphere of L-O-V-E.