For those of us who could use a little libido pick-me-up, the grocery store might be a good place to start.
Like many aspects of our health, our sex drive is affected by what we put into our bodies. A few drinks and a thick steak, followed by a rich chocolate dessert, may sound romantic, but it is actually a prologue to sleep -- not sex.
Humans have sought ways to enhance or improve their sex lives for millennia -- and have never been reluctant to spend money to make themselves better lovers. The ancient Romans were said to prefer such exotic aphrodisiacs as hippo snouts and hyena eyeballs.
Traditional Chinese medicine espoused the use of such rare delicacies as rhino horn.
Modern lovers are no less extravagant. In 2005, for example, according to Amsterdam-based health care information company Wolters Kluwer, Americans spent just under $1.4 billion to treat male sexual function disorders alone.
Of that amount, Viagra rang up $1.2 billion in sales for Pfizer [Get Quote], or 60% of the total market. Among the other drugs trying to find their way into American bedside tables and back pockets are Levitra, which is made by Bayer, but marketed in the US by GlaxoSmithKline [Get Quote] and Schering-Plough, and Cialis, which was jointly developed by Eli Lilly and ICOS.
There is a difference, of course, between helping sexual dysfunction and arousing our passions. The problem is that, these days, there are more solutions for the former than the latter.
Aphrodisiacs, for the most part, have been proved to be ineffective. Named for Aphrodite, the Greek goddess of sex and beauty, these include an array of herbs, foods and other 'agents' that are said to awaken and heighten sexual desire. But the 5,000-year tradition of using them is based more on folklore than real science.
"There is no data and no scientific evidence," says Leonore Tiefer, clinical associate professor of psychiatry at the New York University School of Medicine. "Product pushers are very eager to capitalise on myths," she says.
Most libido-enhancing products offer short term benefit at best, according to Dr John Mulhall, director of the Sexual Medicine Programme at New York Presbyterian and associate professor of urology at the Weill Medical College of Cornell University. Mulhall, who also sits on the Nutraceuticals Committee of the Sexual Medicine Society of North America. He says: "Every year we review the literature on these compounds -- these nutraceuticals like nitric oxide and ginseng -- and there are none that have really been shown to be more than a placebo."
When it comes to sexual function, the placebo effect is probably 30% in men and around 50% in women, he says. That means there are a lot of people out there who believe a pill they are taking or a food they are eating is doing a lot of good for them sexually. In reality, their mind is doing all the work.
So, besides renting The Story Of O and opening a bottle of red wine, what can people do to kick start their sex life?
One thing they can do is change their diet.
Soy, for example, binds estrogen receptors, which helps the vaginal area remain lubricated, and combats symptoms of menopause -- particularly hot flashes. Studies have shown that soy is also beneficial to the prostate, a crucial male sex organ.
Chilli peppers and ginger are believed to improve circulation and stimulate nerve endings, which could, in turn, improve sexual pleasure.
Foods that promote weight loss also hold libido-boosting potential. "There has been very solid research showing that obesity is a risk factor for erectile dysfunction and low testosterone," says Dr Ridwan Shabsigh, director of the New York Center for Human Sexuality and associate professor of urology at Columbia University's medical school. "Reducing weight," he says, "results in an increase of testosterone, and thus an increase in sexual function."
"From an erection standpoint, anything that is good for your heart is good for your penis," says Dr Mulhall. Too much saturated fat can, over time, clog arteries and, in doing so, prevent an adequate flow of blood from reaching the genital region. This not only interferes with the ability to perform, but also with sexual pleasure. Too little fat, on the other hand, is also bad.
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"You need fat to produce your hormones," says Beverly Whipple, professor emeritus at Rutgers University and president of the World Association for Sexology. "Cholesterol is metabolised in the liver, and you get your testosterone and estrogen, which you need for your sex drive," she says. Olive oil, salmon and nuts are optimal sources of the 'good' kinds of fats -- monounsaturated and polyunsaturated.
According to Dr Judith Reichman, author of I'm Not in the Mood: What Every Woman Should Known about Improving Her Libido, medical and hormonal problems are major contributors to sexual dysfunction and a low libido -- but so are too much stress, relationship difficulties and psychological issues. Antidepressants, such as Prozac by GlaxoSmithKline and Paxil by Eli Lilly, can negatively impact sex drive as well. 
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