On the other hand, if both actors are uncomfortable kissing, then they may fake or stage a kiss. To do this, you would have to discuss with your co-star beforehand. Find out what they are comfortable with, and how the pair of you would approach the kiss during the scene.
For instance, the scene may be a first, tender kiss, or something more passionate, so you would need to adjust the kissing style, so that you can choreograph the kiss first. Then, you can establish your boundaries for the scene between the two of you.
Then, you can perform a fake kiss if you choose to do so. To do this, one of you will have to gently place your hand or hands on the side of the other actor's neck, so that the fingers are placed behind the ear, and the thumb can be moved to rest on the co-star’s lips. Then, when both actors lean in for the kiss, one can kiss their thumb rather than actually kissing the lips.