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Lady parts are much more sensitive than ours. Just a fact of life. That much abuse can't feel great for hours on end.
While women's sexual parts are more sensitive to stimulation compared to men, the penis is in fact more fragile compared to the vagina. The vagina is designed to birth babies and take in huge objects like an oversized eggplant for example. On the other hand, most men will cry in pain when you insert an eggplant in the penis while most women will likely moan in pleasure when masturbating with an eggplant. Likewise, women are capable of multiple consecutive orgasms compared to men; who are mostly one shot deals. Masters and Johnsons, Kinsey and other researchers in the subject matter already established this as fact.
not sure this addresses the narrower issue of a woman enjoying rough sex for an extended period of time. from my experience women reach a point where it legitimately starts hurting them. where that point is depends on your size, her size, her pain tolerance, and how hard you're hitting it...