Mary Roach’s book, "Gulp: Adventures on the Alimentary Canal," explores the intriguing idea that kissing can be seen as a gentler method of transferring bacteria between individuals. Research indicates that certain bacteria associated with gum disease can be shared between partners through intimate contact, such as kissing. This highlights how our microbiomes are influenced by the people we are close to.

The concept suggests that engaging in intimate relationships could have unexpected health implications, essentially framing an affair as a form of 'bacteriotherapy.' This playful perspective opens up a discussion about the biological connections fostered through physical closeness, while also humorously reflecting on how our relationships might impact our oral health.