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.
Daktaras Kinsis buvo girdėjęs, ir tuo metu, 1940 - aisiais, buvo iškelta teorija, kad jėga, su kuria sėkla išmetama pro kaklelį, yra vaisingumo faktorius.