I do not take Okrand's use of "emperor" for voDleH and ta' to necessarily mean that these words only refer to men. Sexism is often unconscious and culturally driven, and I would find it perfectly plausible to hear that Okrand simply hadn't considered women when he gave us voDleH, and that the word is gender-neutral. On the other hand, if it does only refer to men, then the sexism is in leaving the female version out of the dictionary.