What are the physiological reactions of couples kissing

When couples kiss, various physiological reactions occur, mainly including increased heart rate, increased hormone secretion, changes in muscle tension, saliva exchange, and facial microvascular dilation. These reactions are natural physiological phenomena of the human body during intimate contact, closely related to emotional communication and physiological arousal.

1. Heartbeat Acceleration

When kissing, sympathetic nervous system stimulation can cause an increase in heart rate and a slight rise in blood pressure. This reaction is similar to the physiological state during mild exercise and helps promote blood circulation. Some people may experience brief palpitations, which are usually positively correlated with the level of emotional excitement.

2. Hormone secretion

Kissing stimulates the brain to release neurotransmitters such as oxytocin and dopamine. Oxytocin can enhance intimacy and trust, while dopamine produces pleasurable experiences. Long term partners secrete more endorphins during kissing, which have a natural analgesic effect.

III. Muscle Response

The facial and neck muscles will experience alternating tension and relaxation, especially the fine motor movements of the orbicularis oris and tongue muscles. Some people may unconsciously experience finger grasping or forward leaning movements, which are a manifestation of activated motor nervous system.

4. Saliva Exchange

During kissing, both parties' salivary enzymes and microbial communities will briefly mix. The saliva of healthy individuals contains antibacterial ingredients such as lysozyme, but attention should be paid to the risk of transmission when immune function is low. The amount of saliva exchange is usually proportional to the intensity of kissing.

V. Vascular Reaction

Facial capillary dilation can cause redness and fever in the cheeks, as well as redness in the earlobes and neck. This phenomenon is caused by the release of local vasoactive substances and usually lasts no more than ten minutes. After emotional calm, vascular reactions will naturally subside. Maintaining oral hygiene is a fundamental preparation before kissing, and it is recommended to undergo regular dental check ups and cleaning. People with allergies should pay attention to recent dietary residues, and special populations such as those with oral ulcers or respiratory infections should avoid deep kissing. Moderate kissing can help enhance relationships, but the intimacy level needs to be adjusted according to the comfort level of both parties. Stop immediately and maintain ventilation when experiencing abnormal reactions such as dizziness or difficulty breathing.