Vithoon EungprabhanthMahidol University2018-04-192018-04-191974-08-01Zeitschrift für Rechtsmedizin. Vol.74, No.4 (1974), 301-30414371596004434332-s2.0-0016174445https://repository.li.mahidol.ac.th/handle/20.500.14594/10699This paper consists of two parts. Part I. By examination of records of the rape cases in our department during the year 1971-1972, the maximal morphological survival time of the spermatozoa in the vagina of the victims lated to 6 days post coitum. Part II. Examination of the vaginal smears from women who attended Family Planning Clinic revealed that within 5 days post coitum the daily reduction of the percentage of sperm positive specimen is nearly regular. By means of a graphical diagram, we can assume that the maximal morphological survival time of the spermatozoa in the vagina of a living woman is up to 7 days post coitum. © 1974 Springer-Verlag.Mahidol UniversityMedicineArticleSCOPUS10.1007/BF02114842