The Regular Intimacy

 

O you who have believed, let those whom your right hands possess and those who have not [yet] reached puberty among you ask permission of you [before entering] at three times: before the dawn prayer and when you put aside your clothing [for rest] at noon and after the night prayer. [These are] three times of privacy for you. There is no blame upon you nor upon them beyond these [periods], for they continually circulate among you – some of you, among others. Thus does Allah make clear to you the verses; and Allah is Knowing and Wise.

Michio Kaku

Science Acumen ·nodosreSpth607u12385ga09h20m76h1uc9cg04cc051l1h031c29l5ha94f ·

Kissing is a surprisingly microbial affair. A single passionate kiss lasting 10 seconds transfers about 80 million bacteria between partners, according to a study in Microbiome.

Researchers swabbed couples’ mouths before and after kissing, finding this massive bacterial exchange via saliva. The human mouth hosts over 700 bacterial species. During a kiss, tongues and lips mix saliva, dislodging and swapping microbes.

Most are harmless—some even beneficial, aiding digestion or immune function. Frequent kissing reshapes oral microbiomes. In the study, couples who kissed at least nine times daily had nearly identical salivary bacteria profiles.

After just one kiss, microbial similarity spiked temporarily, but regular intimacy (9+ kisses/day) synchronized microbiomes long-term. This convergence happens because consistent exposure allows dominant bacteria from one partner to colonize the other’s mouth, outcompeting less-adapted strains. It’s like sharing a microbial fingerprint.

Interestingly, cohabiting couples showed similar microbiomes regardless of kissing frequency, suggesting diet, toothpaste, and environment also align bacteria. But kissing accelerates the process. While 80 million sounds alarming, the immune system handles it.

In fact, early microbial exposure via kissing may strengthen immunity—nature’s probiotic swap. So, that daily smooch? It’s not just romantic; it’s a bacterial merger making your mouths microbial twins.