[Thirteen]

See, I hate even being heard pee. And well, its easier when everyone is watching TV, but when it comes to commercial time, or it gets very quiet, I hesitate. And public washrooms, I can't pee with other people in. I'll sit in the bathroom until it's all cleared.

I think its relatively normal to not want people to hear you use the bathroom, especially "Number 2" (if you get what I mean). The idea of poop stinking, and being really gross, is probably where the embarrassment factor comes in. People will assume you stunk up the washroom, or whatever else.