"I have been here before, and I know that the green grass beyond the door has that sweet taste that makes people long for it." The 19th-century British painter Dante Gabriel Rossetti said in the poem "Epiphany" , "The smell is like a long-lasting kiss, it feels like forever."

Animals use body secretions to identify their companions, and humans also do similar things - we rely on kissing. Recently, a study from the University of Pennsylvania, Lafayette, USA, showed that kissing is not limited to conveying feelings. It can release a series of chemicals to make people excited; through saliva communication, people can also "remember" their partner's facial expressions. "smell".

Psychology professor Wendy Hill recruited 15 pairs of adult couples. The researchers measured oxytocin and cortisol levels in the partners after they held hands and kissed. Hill discovered that four-lip intercourse is a switch that can start a chain reaction in the brain, making couples instantly excited and feel relaxed and happy. This may be because saliva contains sex stimulants, which can be "input" directly into the other person's mouth through kissing. These pheromones will leave various traces in the partner's body and memory. "It feels like a baby's insatiable need for breast milk. If it can't be fed for a period of time, it will cause anxiety and cravings," Hill said.

Hill also pointed out that the special feeling during a kiss is not limited to the brain, but also changes in the body. Research shows that a passionate kiss requires step-by-step rhythmic muscle movements to stimulate the production of alpha waves in the brain, which are exactly the same waveforms produced when people are meditating. The reason is that experience and memory allow us to create an ideal picture of how we envision it, which in turn affects the interaction between the mind and the brain.

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