Scientists say more than 40,000 parasites and 250 types of bacteria are exchanged during a typical French kiss.

The study says couples also exchange 0.7 grams of protein, 0.45 grams of fat and 0.19 grams of other organic substances.

The results come from a study carried out to publicise the advantages of good oral hygene in Sweden.

--Eeewwww.

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