Home toilet seats are a solid loop, but public seats have a gap?

In case you don't know what I'm talking about, here is a home toilet: http://media.onsugar.com/files/2010/12/51/2/1164/11643432/95625968a4189acd_toilet_seat.jpg The seat is a solid loop. And here is a public toilet: http://picturesoftoilets.com/images/pictures_of_toilets3.jpg The seat has a gap in the... show more In case you don't know what I'm talking about, here is a home toilet: http://media.onsugar.com/files/2010/12/5...
The seat is a solid loop.
And here is a public toilet: http://picturesoftoilets.com/images/pict...
The seat has a gap in the front.
What is the purpose of the the difference in design? Does anyone know? This has been driving me nuts for ages.
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