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Testosterone is responsible for libido in both sexes. Women have less of it. When kissing, testosterone flows from male saliva to female saliva. Its level in the female body increases. Passion increases.
Other facts:
The lips are an extremely sensitive organ. They have about 10,000 nerve endings. For comparison, there are about 8000 of them in the clitoris.
When kissing, endorphins and oxytocin are released. The first can be called the “joy hormone”, and the second, the “attachment hormone”. Because of them, during a kiss, people feel a surge of joy, happiness, optimism and tenderness.�
Long and passionate kisses raise your blood pressure and increase your heart rate. Because of the movement of the blood, there is a feeling of excitement. Passion.