I'll Stick to Dance Battles, Thank You

Grinding and freak dancing are slang terms for a relatively raunchy dancing set of moves popular in the house and hip-hop dance styles. Grinding is fairly self-explanatory: two or more dancers rub their bodies against each other in a sexual or sexually suggestive manner. 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 United States, where there have been isolated cases of administrators attempting to ban it. The meaning is basically the same as the self-describing term for party dancing. Elements of "grinding" may be seen in a 1987 movie Dirty Dancing, and "grinding" is sometimes referred to by this term as well.

Grinding has also been referred to as "houseing" or "juking". The perreo, a Puerto Rican dance associated with reggaeton, is a type of grinding; The word 'perreo' is derived from the Spanish word "Perro" for "Dog" (as in "doggy-style"). There was also a Puerto Rican music genre associated called perreo, which served as the precursor to reggaeton.

Commonly and particularly at middle school parties, girls are often not comfortable with grinding with boys yet, and prefer to grind with other girls, often in 'grinding chains.' This is not suggesting that they are lesbians, as some may even have boyfriends, but are simply not comfortable with grinding with their boyfriend. In Puerto Rico, the youth scene seems to have a completely different attitude towards this matter as common youth "perreo" parties become part of regular nightlife at a very early age.


Techniques
The most common dance techniques involved in grinding are, but not limited to:

The partners face the same direction so that one partner's (typically the girl's) buttocks are rubbing the other partner's (the boy's) groin. This is the most common technique in the reggaeton scene, otherwise known as perreo. In some parts of the Northeastern United States it is commonly called culiando, which basically translates to grinding. A variation of this technique has the girl supporting her weight with one or two hands on the floor (buttocks in the air) while the boy, holding her by the waist, grinds to the rhythm on the buttocks in a manner that simulates the doggy style sexual position.
The partners, facing each other, straddle each other’s thighs. This may or may not facilitate the rubbing of genitals through their clothing. Pressing up against each other's bodies in order to feel the female's breasts against the male's chest is also common. A less suggestive variation of this is used when dancing the Colmbian-based rhythm champeta.
In grinding, the female may lead the dance with her hips while the male follows, or the male may guide the female's hips from behind with his hands.