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: Doktor Kinsey počul -- v tej dobe kolovala určitá teória, bolo to v 40-tych rokoch, že sila, s akou je semeno vrhnuté na krček maternice, ovplyvňuje fertilitu.