It is said that Americans kiss in daily life, so it is very casual for Americans to move their tongues when kissing.

Courtesy kissing between American acquaintances and differences between men and women. A courtesy kiss is just a gentle touch on both cheeks, not a mouth-to-mouth kiss.

Kissing and French kissing between American couples are not so casual, especially in public, which hardly happens. Maybe it's the influence of film and television dramas. We think they look casual, but they're really not.