Stones as 'toilet paper'?

I read on the BBC at the weekend that these pottery pieces, once thought to be Roman gaming pieces, are now believed to have been used for wiping bottoms. http://www.bbc.co.uk/news/uk-england-21204228 An interesting discovery!



In the same way, some traditional folks in arid, rural, northern Kenya use stones in the absence of other suitable materials (paper, leaves etc). This practice has caused problems in the many pit latrines that have been dug in and around Korr, many by NGOs. Of course, decent toilets and sanitation are important for the health of locals. But it's not enough just to dig the toilet; there has to be accompanying instruction and provision of toilet paper as many toilets have been filled up with stones, rendering them unusable.