The beating pulse, the clammy palms, and the flood of chemicals to our brain - are all part of the mysterious alchemy of attraction.Tonight, Naked Science, explores the mysteries of human sexuality.

• 如果要按照科学角度去分析，并不是可以单凭异性相吸的原理去解释，因为令人产生性欲的原因很多，分别与视觉、感觉、嗅觉有关，几种官感都能刺激脑神经，从而作出反应。