everything is fair so long as you don't intentionally damage your opponent for life.

The following acts constitute fouls in a contest or exhibition of mixed martial arts and may result in penalties, at the discretion of thereferee, if committed: Butting with the head Eye gouging of any kind Biting Spitting at an opponent Hair pulling Fish hooking Groin attacks of any kind Putting a finger into any orifice or any cut or laceration of an opponent Small joint manipulation Striking downward using the point of the elbow Striking to the spine or the back of the head Kicking to the kidney with a heel Throat strikes of any kind, including, without limitation, grabbing the trachea Clawing, pinching or twisting the flesh Grabbing the clavicle Kicking the head of a grounded opponent Kneeing the head of a grounded opponent Stomping a grounded opponent Holding the fence Holding the shorts or gloves of an opponent Using abusive language in fenced ring/fighting area Engaging in any unsportsmanlike conduct that causes injury to an opponent Attacking an opponent on or during the break Attacking an opponent who is under the care of the referee Attacking an opponent after the bell has sounded the end of the round Timidity, including, without limitation, avoiding contact with an opponent, intentionally or consistently dropping the mouthpiece or faking an injury Throwing opponent out of ring/fighting area Flagrantly disregarding the instructions of the referee Spiking an opponent to the canvas on his head or neck Interference by the corner Applying any foreign substance to the hair or body to gain an advantage Disqualification may occur after any combination of fouls or after a flagrant foul at the discretion of the referee