There is very little evidence to support the effectiveness of substances we define as aphrodisiacs. Some scientific research refutes the theory that foods such as chocolate, parsley and others can increase sex drive in both women and men. Some aphrodisiacs can be dangerous to health, say experts. Spanish fly essence, for example, is a known aphrodisiac, but it can cause kidney damage and gastrointestinal bleeding. The aphrodisiac can be found in powder or drop form. The Spanish fly is a beetle that contains the poisonous chemical cantharidin. Therefore, it is advisable to be very careful with the dosage, due to the fact that the margin between its lethal action and the effect of excitability is very small. Other products marketed as natural aphrodisiacs contain narcotic ingredients, such as sildenafil, the active ingredient in Viagra. These ingredients can have a negative effect on the human body. They are especially dangerous for people with diagnosed diseases or undergoing special treatment. When using products that increase sexual desire, it is recommended to consult a specialist. The expert person can suggest appropriate strategies to improve sexual health without harming the body. There must be a connection between the partners, be it platonic or physical. It helps with sexual desire and enhances emotions during intercourse. Before resorting to the use of aphrodisiacs, all other problems must first be ruled out.