One of the reasons I haven't let anyone give me an enema is because of the expulsion.
First, I'd be mortified if I leaked or had an accident.
Second, the sounds. When my ex-boyfriend had a bad case of food poisoning, he came out of the bathroom and said, "It sounded like a thousand ducks going over a waterfall." I can't get over that remark and would hate for anyone to hear me expel.
Third, I wouldn't want him to see any fecal matter coming from me. Even if there was just a little smudge on the nozzle, I'd feel ashamed.
Fourth, well, the odor. I've always been shy about that. In a house with six family members and one bathroom, there was little privacy. My father was a rather blue collar man and had a gross sense of humor. He'd make jokes about the odor when coming out of the bathroom or when going into the bathroom after someone else had been there. And if anyone was in a bad mood, his comment was always, "What's wrong with you? Are your hemorrhoids bugging you?" So due to all the immature, embarrassing scatological jokes, I've always been very private about bathroom matters.
To this day, I prefer to be the only one in the house, the door locked and the water running. If someone is in the house with me, I like them to be in a room far away from the bathroom and with the tv or music on. I'm just skittish about the whole elimination thing when it comes to bowel movements.
I'm not so shy about urinating. In fact, I tend to leave the door open when I go and will carry on conversations with friends. I don't really care who watches when I pee.