Commentary for Avodah Zarah 40:1
ולא בבגדי צבע [של] אשה ולא בחמור ולא בחמורה ולא בחזיר ולא בחזירה ולא בעופות בזמן שנזקקין זה לזה ואפילו מלא עינים כמלאך המות
nor at a woman’s colored garments, nor at male and female donkeys, or a pig and a sow or at fowls when they are mating; even if one be all eyes like the Angel of Death!
Daf Shevui to Avodah Zarah
This baraita seems to say that one cannot look at anything that might be sexually enticing. This includes any woman and even at animals (and even ugly ones) when they are mating. One should guard oneself constantly against stirring up desire. This would obviously be a very hard rule to observe in the modern age. The angel of death evidently has eyes everywhere. Even if a human had this many eyes and could not help seeing everything, he still should make sure he does not look at anything improper.
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