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.
O Dr. Kinsey tinha ouvido dizer — havia uma teoria mais ou menos vigente naquela altura, nos anos 40 — que a força com que o sémen é expelido contra o colo do útero era um fator na fertilidade.