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.
キンゼイ博士は― ―これは1940年代当時広まっていた学説なのですが― 射精時に精液が 子宮口に向かって放たれる速度が 受胎率に関係するという説が