Why can love make people feel happy both physically and mentally?

Falling in love, in just 0.2 seconds, triggers a sweet chemical reaction in the brain.
Dopamine surges in like a tide, making you want more of your loved one; Oxytocin gently wraps around you, making you want to snuggle tightly next to him/her.

These hormones invigorate the mind, regulate emotions, reduce anxiety and depression, enhance trust, and create a sense of happiness.
Embracing in love is a healing medicine for the soul. When couples embrace, the secretion of oxytocin in the body increases, and blood pressure and heart rate decrease accordingly. The warm touch of embrace, connected to the brain through the vagus nerve, seems to coat the soul with a soft armor, resisting the invasion of depression and anxiety.
Kissing, this seemingly simple action, actually contains enormous health magic. When kissing, endorphins in the brain are released like springs, which are natural anesthetics that can effectively relieve pain. What's even more amazing is that kissing can also prevent allergies, lower cholesterol, and allow couples to harvest health in sweetness.
A healthy sex life is a comprehensive nourishment for both body and mind, which can rejuvenate and invigorate people, promote blood circulation, and benefit both the heart and skin greatly. On the second day after sexual activity, the brain seems to be reactivated, and memory and computational abilities significantly improve. For women, sexual activity can also stimulate estrogen secretion and maintain bone health; For men, regular sexual activity can reduce the risk of prostate cancer.