RT Book, Section A1 Cunningham, F. Gary A1 Leveno, Kenneth J. A1 Bloom, Steven L. A1 Dashe, Jodi S. A1 Hoffman, Barbara L. A1 Casey, Brian M. A1 Spong, Catherine Y. SR Print(0) ID 1160783155 T1 Contraception T2 Williams Obstetrics, 25e YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9781259644320 LK obgyn.mhmedical.com/content.aspx?aid=1160783155 RD 2024/10/10 AB From the evidence available, it appears to be tolerably satisfactorily demonstrated that in women who copulate at frequent intervals the tube must be regarded as a species of receptaculum seminis, in which spermatozoa are always present and waiting for the ovum, and that fertilization usually occurs in the tubes and only rarely in the uterus.—J. Whitridge Williams (1903)