1.Natural lubrication: Harmonious sex improves the production of cervical mucus, which helps sperm to swim towards the egg. 2.Attraction of sperm toward the cervix. The vaginal muscles spasm during female orgasm, attracting sperm towards the egg. 3.Reduces stress. As with men, how much stress a woman is under can lead to endocrine disorders thus affecting fertility. Physical contact can cause women to release oxytocin, which reduces stress and anxiety. For men: 1, healthier sperm. The better the sex life, the fresher and healthier the sperm. 2.Improve sperm production. A regular sex life can improve sperm production. Have sex at least once a week to maintain good sperm production. 3.Improve androgen. Sexual desire is closely related to male health. A harmonious sex life can improve androgen production, which will increase sperm production, improve male vitality and reduce stress. 4, improve cardiovascular health. Harmonious sex can promote blood flow, improve the quality of sex life and the vitality of both sexes. 5, reduce stress. Physical intimacy (including cuddling) can reduce stress, improve gender relations, improve the quality of sex life, thereby improving fertility and overall health.