I never realized that so much went into the basic porcelain toilet!
I was watching one of those murder mystery shows the other day, and a woman died by drowning in the toilet. So the police brought in a Forensic Plumber, and he told the police it was impossible for that to happen. Toilets by design do not let a person drown in them because upon passing out, a person's body weigh pulls them out. And people cannot get their shoulders into them, so you can get your nose wet, and your mouth wet, but can never get your nose and mouth into the
water at the same time. Basically, the lowly ole toilet is well engineered.
As for why the woman did, let's just say that her husband is now spending the rest of his life in prison.