A new study has revealed that as many as 80 million bacteria can be transferred during a French Kiss. To identify the effect of French Kiss, researchers in Netherlands Organization for Applied Scientific Research (TNO) team did an investigation on 21 couples by self-administered questionnaires about their past kissing behavior and by the evaluation of their tongue and saliva samples.
The study concentrated on the effect of intimate kissing on the oral microbiota of the participated couples. A total of 42 individuals (21 couples) between 17 and 45 years old were recruited for this study.
It is revealed that an intimate kiss did not lead to a significant additional increase of the average similarity of the oral microbiota between partners. However, clear correlations were observed between the similarity indices of the salivary microbiota of couples.
This study also indicates that a shared salivary microbiota requires a frequent and recent bacterial exchange and is therefore most pronounced in couples with relatively high intimate kiss frequencies.
To quantify the amounts of bacteria exchanged during a intimate kissing, the study used marker bacteria through the intake of a probiotic yoghurt drink by one of the partners prior to a second intimate kiss. In this controlled experiments for bacterial transfer, it is revealed that during a intimate kiss of 10 s, an average total bacterial transfer can be upto 80 million bacteria’s.
They also found that couples who had intimate kisses at least nine times a day were more likely to share similar communities of oral bacteria.
The study was published in the journal Microbiome
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