R. Eliezer said to them: Didn't Shimon b. Shetach hang women in Ashkelon? They answered; He hanged eighty women and (even though) two are not to be judged on one day, but "the times required it." (Here, too, [vis-à-vis hanging] the times required it.) [A man is stoned naked, but a woman is not stoned naked. R. Yehudah says: Both a man and a woman (are stoned naked.) But a man is hanged with his face towards the people and his back towards the tree; and a woman, with her face towards the tree and her back towards the people. A man is covered one section (his genitals) in front, and a woman, two sections — one in front and one behind, because she is all ervah (illicit nakedness).]
Shimon ben Shetach and the Eighty Witches
Sifrei Devarim 221:2