I have had this habit since an early age. I find it one of the few places and times I can read something undisturbed, and relax to let nature take its course. It also is making use of time otherwise 'wasted'.
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Name : Keith26538, Gender : M, Sexual Orientation : Straight, Race : White/Caucasian, Age : 38, City : Madison, State : WI Country : United States, Occupation : Mechanic, Education level : Technical School, Social class : Lower middle class,  I'm a female and I read while handling business, especially if I know I'm going to take a while...I'm a college student and I have to economize my time, so if I know it's going to take more than a minute, why not take some of my assigned reading or the new novel I just bought with me? I'm not doing anything else with my hands at the time. But maybe that's just me. It's better than staring at the wall or ceiling.
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Name : Dee, Gender : F, Sexual Orientation : Straight, Race : Black/African American, Religion : Baptist, Age : 19, City : Dallas, State : TX Country : United States, Occupation : full time student, Education level : 2 Years of College, Social class : Middle class,  Im a woman and I along with every other family member I know of was potty trained with books. the girls and the guys. Its important to have a bowel movement each day, so I encouraged my son as a youngster to grab a magazine or book before going to the bathroom.
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Name : Tamika, Gender : F, Sexual Orientation : Straight, Race : Black/African American, Religion : Christian, Age : 34, City : Detroit, State : MI Country : United States, Occupation : technician, Education level : 2 Years of College, Social class : Lower middle class,  I've always read while on the toilet. These days because I don't spend a long time on the crapper, I like to look at catalogs. It's entertaining and doesn't require worrying about finishing that chapter before you get up. But, I sure do spend a lot of mental money!!!
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Name : Dwanny, Gender : F, Race : White/Caucasian, Religion : Pagan, Age : 53, City : Springtown, State : TX Country : United States,