In general, sex cannot be determined from the bones of a person.

 In general, it is not entirely accurate to say that sex cannot be determined from the bones of a person. In forensic anthropology and bioarchaeology, sex estimation is indeed possible through the analysis of certain skeletal elements, particularly the pelvis and the skull. While it's true that solely relying on bones does not always provide definitive information, especially with children or incomplete remains, experts can often make reasonably accurate determinations based on morphological features that tend to differ between males and females in a population.

The pelvis is the most sexually dimorphic part of the human skeleton because its shape is influenced by the demands of childbirth. Females typically have a wider pelvic inlet, a broader sciatic notch, and more sub-pubic angle than males. The skull also displays sexually dimorphic characteristics, such as a more pronounced brow ridge, a squarer chin, and a more robust mastoid process in males.

However, these biological sex indicators are based on statistical averages, and there is some overlap between the sexes. Factors like individual variation, the age at death, and the population to which the individual belonged can affect the accuracy of sex determination from bones.