最近,美国国立癌症研究所(CNI)的研究人员 Michael Leitzmann 博士及其同事在《美国医学会杂志》上发表文章指出,以往人们认为性活动对前列腺癌的发展起有重要作用,但事实上,有关流行病学数据的调查却受限于病例对照研究,鉴于接受调查的前列腺癌个体多为前列腺恶化或正处于治疗中,因此使得该研究带有某种倾向。研究人员们针对男性射精频次(包括性交射 Recently, Dr. Michael Leitzmann, a researcher at the National Cancer Institute (CNI), and colleagues published an article in the Journal of the American Medical Association that used to think that sexual activity plays an important role in the development of prostate cancer. In fact, Surveys on epidemiological data are limited to case-control studies that give the study a certain bias as most prostate cancer individuals under investigation are experiencing worsening prostate disease or are in the process of being treated. Researchers targeted male ejaculation frequency (including sexual intercourse