An aphrodisiac is a substance that increases sexual desire. The name comes from Aphrodite, the Greek goddess of sexuality and love. Throughout history, many foods, drinks, and behaviors have had a reputation for making sex more attainable and/or pleasurable. However, from a historical and scientific standpoint, the alleged results may have been mainly due to mere belief by their users that they would be effective (i.e., the placebo effect). In particular, Western medical science has no substantiated claims that any particular food increases sexual desire or performance.[dead link]
Some purported aphrodisiacs gain their reputation from the principles of sympathetic magic.
Alkyl nitrites 
Alkyl nitrites (poppers), have a history of use as a sexual enhancement aid, going back about fifty years. According to the text "Isobutyl nitrite and Related Compounds",[unreliable source?] many researchers agree that the alkyl nitrite may be a true aphrodisiac in the sense of promoting and enhancing sexual response.[unreliable medical source?]
Some compounds that activate the melanocortin receptors MC3-R and MC4-R in the brain are effective aphrodisiacs. One compound from this class, bremelanotide, formerly known as PT-141, is undergoing clinical trials for the treatment of sexual arousal disorder and erectile dysfunction. It is intended for both men and women. Preliminary results have proven the efficacy of this drug, however development was suspended due to a side effect of increased blood pressure observed in a small number of trial subjects who administered the drug intra-nasally. On 12 August 2009, Palatin, the company developing the drug, announced positive results (none of the previous heightened blood pressure effects were observed) of a phase I clinical study where trial subjects were instead administered the drug subcutaneously. Palatin is concurrently developing a related compound they call PL-6983.
Melanotan II 
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There is some debate in lay circles as to whether a chemical called phenylethylamine (PEA) present in chocolate is an aphrodisiac. There is some evidence to support the theory that phenethylamine release in the brain may be involved in sexual attraction and arousal due to its similarity to amphetamines, which are widely known to increase arousal, but this compound is quickly degraded by the enzyme MAO and so it is unlikely that any significant concentrations would reach the brain when phenethylamine is taken orally.
Libido is clearly linked to levels of sex hormones, particularly testosterone. When a reduced sex drive occurs in individuals with relatively low levels of testosterone (e.g., post-menopausal women or men over age 60), testosterone supplements will often increase libido. Approaches using a number of precursors intended to raise testosterone levels have been effective in older males, but have not fared well when tested on other groups.
Yohimbine is the main alkaloid of Yohimbe. Yohimbe, but not Yohimbine, is often popularly referred to as a "weak MAO inhibitor." Pharmaceutical preparations of yohimbine do not indicate that the drug, which is approved in the US for treatment of impotence (under such brand names as Yocon,Yohimex, Aphrodyne and Viritab), is an MAO inhibitor. Its main action is as an alpha-adrenergic antagonist, by which yohimbine may increase genital bloodflow and both sexual sensitivity and excitation in some people. Preparations of yohimbe bark are available over-the-counter and should be used with caution. The unrefined yohimbe bark contains several active alkaloids besides yohimbine. Side effects can include rapid pulse, sweating, and anxiety reactions in susceptible people. Pharmaceutical preparations of yohimbine can also produce these side effects at higher doses, but are available in standardized doses which allow the patient to dose in a controlled fashion. Some patients report a cumulative prosexual effect using the drug over time.
Other drugs 
Stimulants affecting the dopamine system such as cocaine and amphetamines (e.g. methamphetamine) are frequently associated with hyperarousal and hypersexuality, though both may impair sexual functioning, particularly with long term use.
Some directly acting dopamine agonists may also cause increased libido, although they can also cause various side effects. Pramipexole is the only dopamine agonist used in medicine as an aphrodisiac, and is sometimes prescribed to counteract the decrease in libido associated with SSRI antidepressant drugs. The older dopamine agonist apomorphine has been used for the treatment of erectile dysfunction, but is of poor efficacy and has a tendency to cause nausea. Other dopamine agonists such as bromocriptine and cabergoline may also be associated with increased libido, as can the dopamine precursor L-Dopa, but this is often part of a spectrum of side effects which can include mood swings and problem gambling and so these drugs are not prescribed for this purpose.
The libido-enhancing effects of dopamine agonists prescribed for other purposes has led to the development of a number of more selective compounds such as flibanserin, ABT-670 and PF-219,061, which have been developed specifically for the treatment of sexual dysfunction disorders, although none of them have yet passed clinical trials.
Non Aphrodisiacs 
Some psychoactive substances such as alcohol, cannabis,[not in citation given] methaqualone, GHB and MDMA can increase libido and sexual desire. However these drugs are not aphrodisiacs in the strict sense of the definition, as they do not consistently produce aphrodisiac effects as their main action and often actually impair function (hence, Shakespeare's famed statement that alcohol "provokes the desire, but it takes away the performance"). Nonetheless, these drugs are sometimes used to increase sexual pleasure and to reduce sexual inhibition. Anti-erectile dysfunction drugs, such as Viagra and Levitra, are not considered aphrodisiacs because they do not have any direct effect on the libido, although increased ability to attain an erection may be interpreted as increased sexual arousal by users of these drugs.
Aphrodisiac foods and herbs 
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Foods and herbs which have been claimed to be aphrodisiacs include:
- Deer penis and antlers (in Taiwan and China)
- Epimedium grandiflorum (Horny Goat Weed)
- Eurycoma longifolia
- Ginkgo biloba
- Mucuna pruriens
- Socratea exorrhiza
- Spanish fly (cantharidin)
- Tribulus terrestris
- Watermelon Citrulline is a weak nitric oxide stimulator.
Popular culture 
The invention of an Aphrodisiac is the basis of a number of films including Perfume: The Story of a Murderer, Spanish Fly, She'll Follow You Anywhere and Love Potion No. 9. The first segment of Woody Allen's Everything You Always Wanted to Know About Sex* (*But Were Afraid to Ask) is called "Do Aphrodisiacs Work?", and casts Allen as a court jester trying to seduce the queen.
See also 
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