wrestling
1. absolute stupidity organized into rounds and matches. 

2. the only sport where you can get disqualified for getting a woodie. 

3. The only sport where you can die from "penetration", which is why you get disqualified for having a boner.

4. a sport which incorparates 2 pairs of balls that collide at high speeds and vigorously rub together.

5. Olympic wrestling is excluded from all above definitions except for definition 2, I believe.
Boxing is tougher than wrestling N00bidly N00bs!