Does one have to kiss with tongue? Or is there a 'more lips, less tongue' way?

Tongues are not necessary during a kiss.

No, you don't HAVE to kiss with tongue. Eww...This question gave me an image I can't get out of my head now.

I do not advice this when visiting Grandma

. . . But when kissing the love of your life, it depends greatly upon the level of intimacy the situation allows . . . Amongst a group of first graders I recommend a quick peck . . . Around other adults a slightly lingering open mouth is acceptable . . . Behind closed doors, you might hear your dog mutter "Get a ROOM you animals!"

Keep your mudflap inside your head unless you're about to have sex.