Paddling refers to a form of sexual practice where one person, usually the submissive, is repeatedly struck by their dominant. This brings enjoyment to all parties and is generally consensual.
Erotic paddling is also regarded as impact play, which is a form of BDSM.
While paddles are more usually designed to strike the submissive across the buttocks, it can also be used around the genital regions, back of the thighs, breasts, and lower abdomen.