I do not need whip marks - I hate damaging beautiful skin. However, I am not, in that sense, particularly merciful.
I agree that broken legs do not fit into my personal imaginings, but mileage does appear to vary.
No, broken legs have never figured into my crux fantasies. And my desire to be whipped and tortured, as I have said here before, does not include mutilation of my breasts or the destruction of my body.