另外表示楼主作为一个搞Research的人，转帖也太不学术了，看我给你个学术贴。Pubmed里面的一篇paper 《关于棉条使用和处女膜孔大小的临床研究结果》 paper link在此：http://www.ncbi.nlm.nih.gov/pubmed?term=8021768 　 Hymenal findings in adolescent women: impact of tampon use and consensual sexual activity. 　 Abstract We undertook a prospective study of 300 postmenarcheal female subjects (median age, 18.0 years) to examine (1) the relation of tampon use, sports participation, prior gynecologic examination, and consensual sexual activity to hymenal anatomy, (2) the factors leading to choice of tampons by girls not sexually active, and (3) factors related to ease of gynecologic examination. The sample included 100 subjects in group 1, who denied sexual intercourse and used only pads for menses; 100 subjects in group 2, who denied sexual intercourse and had used tampons; and 100 subjects in group 3, who gave a history of sexual intercourse. Sexually active subjects (81%) were significantly more likely than tampon users an (more...)