For me, it is my hair. Judging from all of my relationships with women; I think it is fairly typical. I have a huge antique full length mirror mounted on the wall in my office (and several in my bedroom).
I initially hung it such that I could see myself sitting at my office desk. But I could not resist the frequent urges to "check myself out" in the mirror. This led to playing with my hairstyle, which led to adjusting it, which led to obsessive trials with hair clips, hair bands, scrunchies, etc. Before I knew it, it was an hour later and I was still screwing around in the mirror...
So, I moved the mirror to another wall where I could not see myself just by turning my head. It was a productive move toward managing my "office" time, plus I was proud of myself for exercising good "self control' and "self-discipline".
...I'm still working on what happens when I get up to leave the room and catch that glimpse of myself walking...
It is on my "to do" list...