Is there an issur of making eye contact with your own or someone else's makom bris? I remember seeing a sign by the Arizal's mikvah in Tzfat warning strongly against it (on halachic grounds), but I couldn't find anything in Shulchan Aruch. Can anyone shed some light?
The Tamlud (Shabbat 118b) mentions 1 (or possibly 2) Tannaim who claimed to have never looked (הסתכל) at their "makom bris". This is presented as a rare act of extreme piety, and there is no technical law against it. The Rambam (IB 21:24) and Shulchan Arukh (EH 23:7) mention this ancient practice as well ("Some Chasidim Rishonim used to..."), seemingly as an example of how serious the pious were about avoiding bad thoughts or of how focused they were on studying Torah. It's hard for me to imagine that very many people, if any, nowadays are on the level to be attempting this.