Don’t hold back this Valentine’s Day! A new book says indulging in lust could be good for you.

But not only lust. In “The Joy of Sin: The Psychology of the Seven Deadlies (And Why They Are So Good For You),” Dr. Simon Laham makes a “compelling case” for the “virtues of living a sinful life.”

With the aid of modern research, Laham, a social psychologist from the University of Melbourne, argues that human behavior is more complex than simple "good" or "evil" and shows us that Pride, Lust, Gluttony, Greed, Envy, Sloth and Anger are “not soul-condemning offenses”. He says that the seven deadliest sins are “ever-present” and are largely functional human tendencies “if indulged wisely”.

Laham said that when you take a look at the evidence, the seven deadly sins can really serve us quite well, even though we have been told for centuries they are bad for us.

"This is great news for Australians as a recent BBC poll deemed Australia the most sinful country on earth," he said.

Back in 2010, a poll by the BBC magazine showed that Australia is the most envious country in the world. Aussies also ranked high for the other six deadly sins, making it the world's "most sinful country."

In particular, for lovers intent on indulging in a bit of lust this Valentine's Day, Laham reveals:

Lust can make you smarter. Research shows that people with sex on the brain are better at solving 'analytic thinking' problems. Lust triggers us to become focused on the present and the details of satisfying a rather pressing current goal, namely sex.

Lust makes you helpful. Lust is so well designed to fulfill its function of getting people into bed, that it leads us to behave in ways that potential partners will find more attractive.

Lust builds love. Research shows that lustful participants are more likely to display a range of loving, relationship maintenance strategies - like adopting constructive conflict resolution strategies - to increase the chances of sex in the future.

Gluttony - People who have eaten a piece of cake are more likely to donate to charity.

Greed - Money can buy you happiness as long as you spend it the right way. Studies show that people are happier when they spend their money on experiences rather than material possessions.

Sloth - The ultimate slothful state, sleep and even napping, improves your memory and makes you more insightful. Research has also shown that slowing down makes you more helpful. Studies in cities in which people walk more slowly, such as Bakersfield in California, pedestrians are more likely to stop and offer help.

Anger - Anger triggers an oppositional mindset which makes people more willing to entertain beliefs contrary to their own. In addition, angry negotiators, tend to be more likely to get what they want in a negotiation.

Envy - Comparing yourself to those better off than you can lead to boosts in mood, self-image and creativity.

School students who compared themselves to superior students got better grades.

Pride - Proud people persist longer at difficult tasks and adopt leadership roles. Studies show that the proud are more liked.

Source: University of Melbourne