english: 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.
non_english: Доктор Кінсі чув - та й в 1940-их побутувала така теорія - що сила, з якою сім'я  випорскується в шийку матки, впливала на фертильність.