Why don't we have step-flushing toilets!?

Automatic flushers either are too sensitive or not sensitive enough. Conventional lever flushers get grimy and unsanitary in public restrooms and no one wants to touch one. Why can't we just make a flushing toilet where all you have to do is step on a button or lever to flush the toilet? Its simple, reliable... show more Automatic flushers either are too sensitive or not sensitive enough. Conventional lever flushers get grimy and unsanitary in public restrooms and no one wants to touch one. Why can't we just make a flushing toilet where all you have to do is step on a button or lever to flush the toilet? Its simple, reliable and you dont have to worry about getting grime on your hands (Obviously you should wash your hands anyway but its less you have to wash off).
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