Cheek: 3x08 Knight on the Grid (at the hospital after taking Russ in to visit Haley.)
4x26 The End in the Beginning (in the coma dream when they're watching Motley Crue perform.)
Lips: 3x09 The Santa in the Slush (Caroline's blackmail mistletoe kiss.)
4x26 The End in the Beginning (in the coma dream when they were in bed at the beginning, again when they were in the bedroom changing, and then when Brennan told Booth she's pregnant.)
5x16 The Parts in the Sum of the Whole (In the flashback outside the bar, then at the very end when they left Sweets.)