Grining is a type of close partner dance where two or more dancers rub their bodies (especially the genitalia) against each other in a sexually suggestive manner. It is popular in the house and hip-hop dance styles. It is often performed at nightclubs and parties that play house and hip-hop music. It has also gained popularity at high school and middle school dances across the Western world, where there have been cases of administrators attempting to ban it.