You know what? I don't give a damn. I don't give a damn if you are offended by my posture. Frankly I'm offended by the constant holier than thou attitude I encounter in your posts on a regular basis but I'm fairly sure you don't give a damn about that
I'll chime in with why I've been known to do it. Cancers of the pelvis can give a woman a "full" feeling, sort of like being 5 months pregnant but not showing and backaches are very common. To lean over some takes the pressure off. I've spent the rest of my day trying to look and act as normal as possible. I'm not too worried about my butt sticking out an extra 6 inches in the grocery store and offending the delicate sensibilities of a former nurse who ought to know there are myriad reasons people might feel better walking in that position. I guess you must have been absent on the day they taught compassion in nursing school