Saliva exchange is the act of collecting saliva and putting it into a party (usually of the opposite sex)'s mouth, whether willing or unwilling and usually through kissing. The act is done mostly by teenagers and young adults, but may sometimes be exchanged through preteens.
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Intentional
Usually in intentionality of saliva exchange, drool enters a party's mouth by the sender putting his tongue into the other's mouth, and collecting saliva at the back of the tongue. When enough saliva is collected, the sender opens his mouth and it enters the other person.
Accidental
Sometimes, accidental saliva exchange is created through talking, where spit leaves one's mouth and enters another. Also may happen when a person is lying down with their mouth open and the other drools into his/her mouth by accident.