Spanking

Spanking was an activity performed on backsides, (TV: The Lost Boy) used as both a type of punishment, (TV: The Lost Boy, Last Night) and a form of masturbation. (TV: The Coach with the Dragon Tattoo)

For the Slitheen, spanking with the use of a bartleboigle tree was a form of discipline for children. (TV: The Lost Boy)

John Riddell threatened to "put [Nefertiti] across [his] knee and spank [her]", "Egyptian Queen or not". Nerfertiti dared him to try, as she claimed she'd snap his neck instantly. (TV: Dinosaurs on a Spaceship)

When the Eleventh Doctor told River Song she shouldn't do things like provoke Sontarans, she replied, "You already had me banged up in jail for five years; what else are you going to do? Spank me?" (TV: Last Night)

When Miss Quill asked Ram Singh if there was a "great big window of porn" open as he typed out an assignment, Ram joked he was spanking himself, and did the whole paper using only his left hand. (TV: The Coach with the Dragon Tattoo)