Doctor Kinsey had heard -- and there was a theory going around at the time, this being the 1940s -- that the force with which semen is thrown against the cervix was a factor in fertility.
Doctor Kinsey hade hört och det fanns en teori som florerade på den tiden, det här var på 1940-talet att kraften som sperman är utskjuten mot livmoderhalsen var en faktor för fertilitet.