When I was 22 and was a first-year teacher, one day I was teaching school on a warm spring day when the air conditioning kicked on and blew a chill through the room. My nipples got rock hard.

I wasn't wearing a thick enough bra or dress, and I happened to have a class that was largely composed of 15-year old boys. Needless to say, I lost their attention. A few of them moved their books over their laps. I was mortified, but I think they enjoyed it. This was in 1983 in the pre-Internet days when teenagers didn't yet see way more than that every day on their own computers. Always after that I made sure I wore a padded bra. And I talked to the principal about the thermostat setting!