Researcher Dr Colin Hendrie from the University of Leeds said: ‘Female inoculation with a specific male’s cytomegalovirus is most efficiently achieved through mouth-to-mouth contact and saliva exchange, particularly where the flow of saliva is from the male to the typically shorter female”.
Back in the 1920s, however, scientists were not aware of this – on the contrary. To avoid the spreading of unwanted germs during kising, they invented the ‘kissing screen’ – a net on a stick which can be placed between both mouths.
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