Why do some girls who have been analized refuse to do dp?

This seems kinda weird to me. If they can take an anal pounding, why do some still reject dp? Is dp more painful than anal only for them?
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Bad Samaritan wrote:A girl is likely to cost more when she shoots with multiple men and performs anal, which is necessarily the case for a DP scene. They charge too much for it and producers see that the "pain" is not worth the gain.