I can fully understand the concept of sex for pleasure, as that has been my experience. I dispute the notion that all humans are killers, especially the idea of it for pleasure, although I don't for a nano second dispute the notion that all can become killers under the right circumstances.No Wonder Hemingway Committed Suicide When He Saw the Generations to Come
That's like saying that you can understand sex in order to have a baby, but not sex for pleasure. The two vital instincts are the same in creating a irrestible pleasure as an incentive when the basic need no longer has to be fulfilled for survival of the group. This is more proof that our society has a Death Wish because it is dominated by people who want us weak.
I value nature too much to see such sport killing, as under discussion here, as pleasurable. I don't see weakness, nor a death wish, but respect. Obviously, other's mileage varies.