One of the sages, Rav Giddal, used to sit at the entrance to the women’s ritual bath to explain to those immersing how to properly immerse. The scholars asked this sage: Do you not fear that your urges will overcome you? He answered them: The women seem to be like a flock of white geese, so I do not lust after them. Another sage, R’ Yochanan, also was accustomed to sitting at the entrance to the women’s baths. He defended his questionable custom by saying that since he was handsome, the women who left the ritual bath to go to their husbands would see his beauty and so their offspring would be as good-looking. The scholars asked this sage: Do you not fear the evil eye? He answered them: I am a descendant of Joseph, and the evil eye has no dominion over us, nor does it harm us.
(Babylonian Talmud, Tractate Berachot 20a)