They hated body hair - they considered it filthy.

Best source is tomb paintings.

In Egyptian art, the ideal form is a youthful and slim figure with narrow hips, which anthropometric studies of pharaonic mummies have revealed is a fair representation of reality, at least in the case of Egyptian women. Furthermore, their hip to shoulder proportions are not greatly different from those found in male Egyptian mummies. While both sexes may be depicted in this way, representations of males are more likely to vary from the ideal.