[El_Hombre_Grande]

Its not nearly that cut and dry in other sports, each of which have there own culture. In football, holding in the trenches is kind of accepted as "much as i can get away with." But cut blocking, not so much. In Golf, cheating is always cheating and dishonorable. In baseball, spitballs fall under the "whatever you can get away with" category and throwing at someone's head does not (although it used to).
In Hockey and boxing we've seen limits placed on even the most brutal sports (not many boxers came out in favor of Tyson's ear eating) In Poker, as you noted, I don't think there is a lot of consensus. I think its because of how many "angle shooters" have traditionally tried the game, and the fact that it was largely illegal in most places for a long time. Thus the "whatever I can get away with" attitude has too much support.