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.
1940년대의 일인데 킨지 박사는 정액이 자궁경부로 분출되는 압력이 임신률을 좌우하는 요소의 하나가 된다는 하나의 설을 들었지요.