@WissenMachtFrei Yes, you always have to kiss the person performing the tea ceremony on the mouth. If you're not used to this, it can lead to awkward reactions (both for same sex and opposite sex kisses!). I guess if you grow up with this tradition, it is just normal, but for me it still feels a little strange...
@WissenMachtFrei I might have misinterpreted the intent of your question... Of course in traditional tea ceremony there is usually no kissing involved. (Sorry to disappoint ;))