深入精子库，为何那么多人生不出孩子

Core Viewpoint - The article discusses the challenges and opportunities in reproductive health, emphasizing the importance of early childbearing and the declining quality of male sperm, while also highlighting the advancements in assisted reproductive technologies [4][5][6]. Group 1: Reproductive Health Challenges - The incidence of infertility in China has increased from 12% in 2007 to 18% in 2020, with male and female factors contributing equally to infertility [9]. - Women over 35 face significant declines in fertility due to reduced egg quantity and quality, while men also experience declining sperm quality with age [8][9]. - The societal trend of late marriage and childbearing is influenced by various factors, including career pressures and educational costs, leading to a rise in high-age pregnancies [9][10]. Group 2: Sperm Quality Decline - Data from the Central South University shows a significant decline in sperm quality, with the acceptance rate for donated sperm dropping from 45.9% in 2006 to around 20% currently [11][12]. - The World Health Organization has revised the normal reference values for sperm parameters, indicating a downward trend in male fertility [11][12]. - Factors such as lifestyle choices, including sleep patterns and stress, significantly impact sperm quality, with younger individuals showing better sperm parameters compared to older students [13][16]. Group 3: Assisted Reproductive Technologies - The Central South University reproductive center has frozen approximately 820,000 embryos, with many serving as a form of "fertility insurance" for couples [28]. - The center emphasizes the importance of sperm donation and the strict regulations surrounding it, including the anonymity of donors and the limitation on the number of births per donor [20][22]. - Advances in reproductive technology are shifting the focus from sperm donation to self-sperm storage and fertility preservation, reflecting a growing trend in the market [23][28].