这几天听”How not age”到了维护性功能这一章，Michael Greger 如同男闺蜜一般碎碎叨叨聊女生性功能健康，非常温馨。讲得真系统，学到很多。先从基础的来吧：
美国的数据：73%的55-64岁之间的成年人有性生活，到了75-85岁，就只有26%了。
–如何衡量女生性功能？激素方面，主要是睾丸酮-Testosterone。到50岁的时候激素水平就是年轻时候的50%了。另外一个衡量是问卷
--这些方面：Variables of interest fall into the domains of importance of sex（性爱对你重要吗）, sexual desire（你的欲望强烈吗？）, frequency of activities (sexual intercourse and masturbation-性生活的频率，包括和伴侣，以及自慰), physical pleasure（体感如何）, emotional satisfaction with partner（内心的愉悦）, arousal（激动吗）, and pain（有没有痛感）
–一个女生的临床实验的问卷包括了下面这些问题，All study women were asked (5 point scale):
--How important was sex in their lives (not at all to extremely)
--How often they felt desire in the past 6 months to engage in any form of sexual activity either alone or with a partner (not at all to daily), frequency of engaging in masturbation in the past 6 months
--If they had engaged in sexual activities with a partner in the last 6 months (yes/no)
--Respondents who reported having engaged in sexual activities with a partner in the last six months were asked about frequency of sexual intercourse and arousal during sexual activity (not at all to daily), and degree of emotional satisfaction and physical pleasure from their relationship with a partner (not at all to extremely). Frequency of vaginal or pelvic pain during intercourse
--Chinese and Japanese women reported less importance, desire, masturbation, arousal, and more pain, while African-American women reported greater importance, frequency, and pain, but less arousal, emotional satisfaction, and physical pleasure than did Caucasian women.用白人女生作对照，中国和日本女生报告相对较低的：性生活的重要性，欲望，自慰频率，激动程度，和更多的痛感。感觉这个2010年的文章的数据已经和现代中国女生不符。
–良好的性生活是身体健康的表现，同时性爱过程中释放的endorphins, 快乐激素提高免疫功能(natural killer cell function)。
–Greger 分享了很多改善措施，从饮食，熏香，控制疾病，规避风险等等，以后再聊。总得先知道自己的现状吧LOL
ref: 

1. Masturbation frequency and sexual function domains are associated with serum reproductive hormone levels across the menopausal transition
2. Longitudinal Changes in Sexual Functioning as Women Transition Through Menopause: Results from the Study of Women’s Health Across the Nation (SWAN)