A person's DNA stays in you for up to an hour after kissing.
Male DNA can be detected in a woman's saliva for up to an hour after you kiss.
When two people kiss they exchange bacteria and mucus as well as some DNA which is your genetic doe.
No matter how fleeting the kissing encounter was the DNA will hang around and remain in the other persons mouth for up to 60 minutes which is an hour.
Although, the amount and detectability of the DNA decreases over time due to the natural cleansing process of saliva and swallowing.
Sperm DNA in the mouth though can remain in the mouth for up to 8 hours.
Human DNA is a molecule that contains the genetic information for an organism's development and function.
DNA is short for deoxyribonucleic acid and is made up of 2 strands which twist around each other to form a double helix.
Each strand has a backbone of alternating sugar and phosphate groups and each sugar also has a base that is attached to it.
The bases are called adenine (A), cytosine (C), guanine (G), and thymine (T).
The 2 strands are held together by chemical bonds between the bases with adenine pairing with the thymine and cytosine pairing with guanine.
The diploid human genome is composed of 46 DNA molecules of 24 distinct types.
And because human chromosomes exist in pairs that are almost identical, only 3 billion nucleotide pairs (the haploid genome) need to be sequenced to gain complete information concerning a representative human genome.