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Everything done between two consenting adults should be legal, as long as it doesn't directly harm anyone else.
There are guys who get paid by companies to do extreme things such a hanggliding, bungee jumping and so forth. The army paratroopers and such also another example.
A great difference. The point of blood sport is to hurt someone, to the delight of an audience.
whether it's the point or is unavoidable...there is very little difference.