2,254. Things That Lead to Impure Thoughts

Hilchos Issurei Biah 21:20

One may not watch domesticated animals, wild animals or birds while they’re mating, though it’s permitted for a breeder to insert the male animal into the female. Since he is involved in his profession, he won’t be distracted with impure thoughts.

Hilchos Issurei Biah 21:21

It is likewise prohibited for men to watch women while they do laundry. It’s even prohibited to stare at the colored garments of a woman that one knows (e.g., while they’re hanging on the line) out of concern that he will have impure thoughts.