There has been research to suggest that the orgasm can reduce pain. This is from the abstract of How does vaginal stimulation produce pleasure, pain, and analgesia?:

 "...sensory input produced by vaginal stimulation produces a powerful analgesic effect. The function of this process may be to promote the behavioral patterns that result in fertilization, parturition, and maternal care of the young, thereby promoting procreation. Since sensory stimulation that occurs normally during mating and parturition could become sufficiently intense to reach aversive levels, it would seem adaptive for a mechanism to exist that could diminish the ability of aversive sensory activity from the genital system to interfere with mating behavior and perhaps with maternal behavior and nursing. In humans, the pleasurable component of vaginal stimulation could be an adaptive mechanism whose function is to promote and ensure procreation. In that sense, "sexual pleasure" could be a significant adaptive factor in the physiology of reproduction and the evolution of the species." (Komisaruk and Whipple, 2000)


https://www.researchgate.net/publication/232431903_How_does_vaginal_stimulation_produce_pleasure_pain_and_analgesia
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