First of all, Spanish Fly isn't from a fly. This so-called aphrodisiac is made by drying and grinding up beetles... Second: Most of what is sold as Spanish Fly does not contain any beetle parts. Lot's of advertising hype is out there trying to cash in on the repuation of this insect and the ignorance of the public. Third: Real Spanish Fly is toxic, and doesn't do much for the libido.

The insects used to produce real Spanish Fly are also known as blister beetles. They contain a very irritating chemical, which inflames the urethra and can cause an erection (although it isn't altogether a pleasant one). Spanish Fly is used by animal breeders to motivate sluggish bulls to breed.

In humans, Spanish fly can cause priapism, a painful erection that won't stop (and requires immediate medical attention). It can also cause permanent kidney damage and even death. It burns and blisters if more than a microsocpic trace is absorbed by the skin. And it won't drive a women wild with pleasure - although the discomfort may drive her to the visit her gynecologist.

Read the advertising copy carefully - most sites offering 'Spanish Fly' don't claim that their product actually contains Spanish fly, only that it "induces the effect of" or "replicates" Spanish fly, while being non-toxic. Some of the sites out there don't even say what is in the product. The most common ingredient in Spanish fly is capsaicin from hot peppers - much safer, but hardly a bargain at $20 to $40 a bottle. In Germany, some products contain homeopathically dilutions of the real Spanish fly. Homeopathic dilution means that little or no active ingredient is present, and if you believe in homeopathy, then this ultra-dilute material is supposed to have the opposite effect of a normal dose (ie, no erection, no increased sensation down below).

The famed Simon Bolivar apparently had his life shortened by Spanish Fly, although he did not take it as an aphrodisiac. Near the end of his life, an extract of cantharides was prescribed for use on his neck and shoulders to drain the 'excess humors' that were believed to be causing his illness. This was in a time when doctors routinely prescribed toxic 'medicines' including mercury salts. Bolivar typically avoided going to doctors. (see PubMed 17989849)

Do yourself a favor and cross Spanish Fly off the list of things you would ever consider doing to yourself. Ginseng is one alternative that may actually be good for a person when taken in moderation. And DHEA may have some risks, but is a molecule produced by the body, and is converted to testosterone.