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Horn of rhinoceros. Penis of tiger. Root of sea holly. Husk of the emerald-green blister beetle known as the Spanish fly. So colourful and exotic is the list of substances that have been claimed to heighten sexual appetite that it is hard not to feel a twinge of disappointment on first beholding the latest entry - a small, white plastic nasal inhaler containing an odourless, colourless synthetic chemical called PT-141. Plain as it is, however, there is one thing that distinguishes PT-141 from the 4,000 years' worth of recorded medicinal aphrodisiacs that precede it: this one actually works.

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